diff --git a/api/src/org/labkey/api/action/SimpleViewAction.java b/api/src/org/labkey/api/action/SimpleViewAction.java
index 5a9c1cb964a..f669e66838a 100644
--- a/api/src/org/labkey/api/action/SimpleViewAction.java
+++ b/api/src/org/labkey/api/action/SimpleViewAction.java
@@ -16,6 +16,7 @@
 
 package org.labkey.api.action;
 
+import org.jetbrains.annotations.NotNull;
 import org.labkey.api.miniprofiler.MiniProfiler;
 import org.labkey.api.miniprofiler.Timing;
 import org.labkey.api.view.BadRequestException;
@@ -134,7 +135,7 @@ public ModelAndView getPrintView(FORM form, BindException errors) throws Excepti
     }
 
     @Override
-    public void validate(Object target, Errors errors)
+    public void validate(@NotNull Object target, @NotNull Errors errors)
     {
     }
 }
diff --git a/api/src/org/labkey/api/data/ColumnInfo.java b/api/src/org/labkey/api/data/ColumnInfo.java
index f3457a0ee7e..aee4c8880c3 100644
--- a/api/src/org/labkey/api/data/ColumnInfo.java
+++ b/api/src/org/labkey/api/data/ColumnInfo.java
@@ -134,7 +134,7 @@ static int findColumn(ResultSet rs, String name)
      * new SQLFragment().append(col.getValueSql("R")).append(" AS ").appendIdentifier(col.getAlias())
      * The returned ResultSet will contain a column named col.getAlias()
      *
-     * NOTE: if you directly bind your results using BeanObjectFactory (e.g. TableSelector.getArrayList(MyClass.class))
+     * NOTE: if you directly bind your results using BeanObjectFactory (e.g., TableSelector.getArrayList(MyClass.class))
      * you should
      *  a) match your column aliases to the bean properties you want to populate
      *  b) prefer using TableSelector vs SqlSelector.  TableSelector will use ColumnInfo.getAlias().
diff --git a/api/src/org/labkey/api/reports/report/r/view/HtmlOutput.java b/api/src/org/labkey/api/reports/report/r/view/HtmlOutput.java
index e682379b4ff..40a23b1a927 100644
--- a/api/src/org/labkey/api/reports/report/r/view/HtmlOutput.java
+++ b/api/src/org/labkey/api/reports/report/r/view/HtmlOutput.java
@@ -94,7 +94,7 @@ public HtmlOutputView(ParamReplacement param, String label)
         protected String renderInternalAsString(File file) throws Exception
         {
             if (exists(file))
-                return PageFlowUtil.getFileContentsAsString(file);
+                return PageFlowUtil.addScriptNonces(PageFlowUtil.getFileContentsAsString(file));
 
             return null;
         }
diff --git a/api/src/org/labkey/api/security/Directive.java b/api/src/org/labkey/api/security/Directive.java
index 22c9d645f50..dcc8a9ac416 100644
--- a/api/src/org/labkey/api/security/Directive.java
+++ b/api/src/org/labkey/api/security/Directive.java
@@ -5,7 +5,7 @@
 
 /**
  * All CSP directives that support substitutions. These constant names are persisted to the database, so be careful with
- * any changes. If adding a Directive, make sure to add the corresponding substitutions to application.properties.
+ * any changes. If adding a Directive, make sure to add the corresponding substitutions in LabKeyServer baseCsp.
  */
 public enum Directive implements StartupProperty, SafeToRenderEnum
 {
@@ -13,6 +13,7 @@ public enum Directive implements StartupProperty, SafeToRenderEnum
     Font("font-src", "Sources for fonts"),
     Frame("frame-src", "Sources for iframes"),
     Image("image-src", "Sources for images"),
+    Object("object-src", "Sources for objects"), // Issue 53226
     Style("style-src", "Sources for stylesheets");
 
     private final String _cspDirective;
diff --git a/api/src/org/labkey/api/security/SecurityManager.java b/api/src/org/labkey/api/security/SecurityManager.java
index af804bcd319..803153481a7 100644
--- a/api/src/org/labkey/api/security/SecurityManager.java
+++ b/api/src/org/labkey/api/security/SecurityManager.java
@@ -236,7 +236,7 @@ public static void registerAllowedConnectionSource(String key, String serviceURL
     {
         if (StringUtils.trimToNull(serviceURL) == null)
         {
-            ContentSecurityPolicyFilter.unregisterAllowedSources(Directive.Connection, key);
+            ContentSecurityPolicyFilter.unregisterAllowedSources(key, Directive.Connection);
             LOG.trace(String.format("Unregistered [%1$s] as an allowed connection source", key));
             return;
         }
diff --git a/api/src/org/labkey/api/util/PageFlowUtil.java b/api/src/org/labkey/api/util/PageFlowUtil.java
index 2a961c70986..f071aea5a61 100644
--- a/api/src/org/labkey/api/util/PageFlowUtil.java
+++ b/api/src/org/labkey/api/util/PageFlowUtil.java
@@ -3156,4 +3156,51 @@ public static HtmlString getDataRegionHtmlForPropertyValues(Map<String, String>
         return HtmlString.unsafe(sb.toString());
     }
 
+    /**
+     * Convert String containing HTML into a Document, add nonces to all {@code <script>} tags, and turn the Document
+     * back into a String.
+     */
+    public static String addScriptNonces(String html)
+    {
+        Document doc = JSoupUtil.convertHtmlToDocument(StringUtils.trimToEmpty(html), false, new LinkedList<>());
+        String ret = "";
+        if (doc != null)
+        {
+            addScriptNonces(doc);
+            try
+            {
+                ret = convertNodeToHtml(doc);
+            }
+            catch (TransformerException | IOException e)
+            {
+                throw new RuntimeException(e);
+            }
+        }
+
+        return ret;
+    }
+
+    /*
+     * Add nonce attribute to <script> tags in the Document.
+     * We don't require the <%=scriptNonce%> syntax (as with module HTML view), because we already parsed the page.
+     * ModuleHtmlView does not parse the page and does a raw regexp substitution.
+     */
+    public static int addScriptNonces(Document doc)
+    {
+        NodeList nl = doc.getElementsByTagName("script");
+
+        if (nl.getLength() > 0)
+        {
+            // If rendering outside a request (e.g., search crawler), substitute blank
+            String nonce = HttpView.hasCurrentView() ? HttpView.currentPageConfig().getScriptNonce().toString() : "";
+
+            for (int i = 0, length = nl.getLength(); i < length; i++)
+            {
+                Element script = (Element) nl.item(i);
+                script.setAttribute("nonce", nonce);
+            }
+        }
+
+        return nl.getLength();
+    }
 }
diff --git a/api/src/org/labkey/filters/ContentSecurityPolicyFilter.java b/api/src/org/labkey/filters/ContentSecurityPolicyFilter.java
index f418d428d01..8e96eaf7774 100644
--- a/api/src/org/labkey/filters/ContentSecurityPolicyFilter.java
+++ b/api/src/org/labkey/filters/ContentSecurityPolicyFilter.java
@@ -263,7 +263,7 @@ public static void registerAllowedSources(String key, Directive directive, Strin
         }
     }
 
-    public static void unregisterAllowedSources(Directive directive, String key)
+    public static void unregisterAllowedSources(String key, Directive directive)
     {
         synchronized (SUBSTITUTION_LOCK)
         {
@@ -293,6 +293,9 @@ public static void regenerateSubstitutionMap()
                         .collect(Collectors.joining(" ")))
                 );
 
+            // Special case for object-src: default to 'none' if no admin overrides exist, Issue 53226
+            SUBSTITUTION_MAP.putIfAbsent(Directive.Object.getSubstitutionKey(), "'none'");
+
             // Add an empty substitution for sources that lack registrations. This strips them from the stashed policy,
             // meaning less work on every request.
             Arrays.stream(Directive.values())
@@ -395,14 +398,14 @@ public void testSubstitutionMap()
                     // Initial checks
                     assertTrue(ALLOWED_SOURCES.isEmpty());
                     verifySubstitutionMapSize(0);
-                    // All "allowed sources" substitutions should be replaced with empty strings
+                    // All "allowed sources" substitutions should be replaced with empty string or 'none' (object-src)
                     verifySubstitutionInPolicyExpressions(".SOURCES}", 0);
                     // Should have been substitution in init()
                     verifySubstitutionInPolicyExpressions("${CSP.REPORT.PARAMS}", 0);
                     verifySubstitutionInPolicyExpressions("${", 0);
 
                     // Now unregister and register sources for each Directive, testing expectations along the way
-                    unregisterAllowedSources(Directive.Connection, "foo");
+                    unregisterAllowedSources("foo", Directive.Connection);
                     assertTrue(ALLOWED_SOURCES.isEmpty());
                     verifySubstitutionMapSize(0);
                     registerAllowedSources("foo", Directive.Connection, "MySource");
@@ -414,7 +417,7 @@ public void testSubstitutionMap()
                     verifySubstitutionMapSize(1);
                     verifySubstitutionInPolicyExpressions("MySource", 1); // Duplicate source should be filtered out
 
-                    unregisterAllowedSources(Directive.Font, "font");
+                    unregisterAllowedSources("font", Directive.Font);
                     registerAllowedSources("font", Directive.Font, "MySource");
                     assertEquals(2, ALLOWED_SOURCES.size());
                     verifySubstitutionMapSize(2);
@@ -424,38 +427,47 @@ public void testSubstitutionMap()
                     verifySubstitutionMapSize(2);
                     verifySubstitutionInPolicyExpressions("MySource", 2);
                     verifySubstitutionInPolicyExpressions("MyFontSource", 1);
-                    unregisterAllowedSources(Directive.Font, "font2");
+                    unregisterAllowedSources("font2", Directive.Font);
                     assertEquals(2, ALLOWED_SOURCES.size());
                     verifySubstitutionMapSize(2);
                     verifySubstitutionInPolicyExpressions("MySource", 2);
                     verifySubstitutionInPolicyExpressions("MyFontSource", 0);
-                    unregisterAllowedSources(Directive.Font, "font");
-                    assertEquals(2, ALLOWED_SOURCES.size()); // Font entry still exists, but should be empty
+                    unregisterAllowedSources("font", Directive.Font);
+                    assertEquals(2, ALLOWED_SOURCES.size()); // Font entry still exists but should be empty
                     assertTrue(ALLOWED_SOURCES.get(Directive.Font).isEmpty());
                     verifySubstitutionMapSize(1);// Back to the way it was
                     verifySubstitutionInPolicyExpressions("MySource", 1);
                     verifySubstitutionInPolicyExpressions("MyFontSource", 0);
 
-                    unregisterAllowedSources(Directive.Frame, "frame");
+                    unregisterAllowedSources("frame", Directive.Frame);
                     registerAllowedSources("frame", Directive.Frame, "FrameSource", "FrameStore");
                     assertEquals(3, ALLOWED_SOURCES.size());
                     verifySubstitutionMapSize(2);
                     verifySubstitutionInPolicyExpressions("FrameSource", 1);
                     verifySubstitutionInPolicyExpressions("FrameStore", 1);
 
-                    unregisterAllowedSources(Directive.Style, "style");
+                    unregisterAllowedSources("style", Directive.Style);
                     registerAllowedSources("style", Directive.Style, "StyleSource", "MoreStylishStore");
                     assertEquals(4, ALLOWED_SOURCES.size());
                     verifySubstitutionMapSize(3);
                     verifySubstitutionInPolicyExpressions("StyleSource", 1);
                     verifySubstitutionInPolicyExpressions("MoreStylishStore", 1);
 
-                    unregisterAllowedSources(Directive.Image, "image");
+                    unregisterAllowedSources("image", Directive.Image);
                     registerAllowedSources("image", Directive.Image, "ImageSource", "BetterImageStore");
                     assertEquals(5, ALLOWED_SOURCES.size());
                     verifySubstitutionMapSize(4);
                     verifySubstitutionInPolicyExpressions("ImageSource", 1);
                     verifySubstitutionInPolicyExpressions("BetterImageStore", 1);
+
+                    unregisterAllowedSources("object", Directive.Object);
+                    verifySubstitutionInPolicyExpressions("'none'", 1);
+                    registerAllowedSources("object", Directive.Object, "ObjectSource", "BetterObjectStore");
+                    assertEquals(6, ALLOWED_SOURCES.size());
+                    verifySubstitutionMapSize(4); // Adding to object-src doesn't change the non-empty count
+                    verifySubstitutionInPolicyExpressions("'none'", 0);
+                    verifySubstitutionInPolicyExpressions("ObjectSource", 1);
+                    verifySubstitutionInPolicyExpressions("BetterObjectStore", 1);
                 }
                 finally
                 {
@@ -491,7 +503,7 @@ private void verifySubstitutionMapSize(long expectedNonEmptyValues)
 
             assertEquals(expectedSubstitutionMapSize, SUBSTITUTION_MAP.size());
             long nonEmptyValues = SUBSTITUTION_MAP.entrySet().stream().filter(e -> !e.getValue().isEmpty()).count();
-            assertEquals(expectedNonEmptyValues, nonEmptyValues);
+            assertEquals(expectedNonEmptyValues + 1, nonEmptyValues); // One extra expected because of OBJECT.SOURCES default value
         }
     }
 }
diff --git a/core/src/org/labkey/core/CoreModule.java b/core/src/org/labkey/core/CoreModule.java
index efbb03d7c61..76db398883d 100644
--- a/core/src/org/labkey/core/CoreModule.java
+++ b/core/src/org/labkey/core/CoreModule.java
@@ -537,7 +537,7 @@ public QuerySchema createSchema(DefaultSchema schema, Module module)
                 false);
         AdminConsole.addOptionalFeatureFlag(new OptionalFeatureFlag(AppProps.DEPRECATED_OBJECT_LEVEL_DISCUSSIONS,
                 "Restore Object-Level Discussions",
-                "This option and all support for Object-Level Discussions will be removed in LabKey Server v25.7.",
+                "This option and all support for Object-Level Discussions will be removed in LabKey Server v25.11.",
                 false, false, FeatureType.Deprecated));
         AdminConsole.addOptionalFeatureFlag(new OptionalFeatureFlag(SimpleTranslator.DEPRECATED_NULL_MISSING_VALUE_RESOLUTION,
                 "Resolve Missing Lookup Values to Null",
diff --git a/core/src/org/labkey/core/analytics/AnalyticsServiceImpl.java b/core/src/org/labkey/core/analytics/AnalyticsServiceImpl.java
index 3435318f80f..822288dcdd3 100644
--- a/core/src/org/labkey/core/analytics/AnalyticsServiceImpl.java
+++ b/core/src/org/labkey/core/analytics/AnalyticsServiceImpl.java
@@ -118,13 +118,13 @@ public String getDescription()
 
     public void resetCSP()
     {
-        ContentSecurityPolicyFilter.unregisterAllowedSources(Directive.Connection, ANALYTICS_CSP_KEY);
-        ContentSecurityPolicyFilter.unregisterAllowedSources(Directive.Image, ANALYTICS_CSP_KEY);
+        ContentSecurityPolicyFilter.unregisterAllowedSources(ANALYTICS_CSP_KEY, Directive.Connection);
+        ContentSecurityPolicyFilter.unregisterAllowedSources(ANALYTICS_CSP_KEY, Directive.Image);
 
         if (getTrackingStatus().contains(TrackingStatus.ga4FullUrl))
         {
-            ContentSecurityPolicyFilter.registerAllowedSources(Directive.Connection, ANALYTICS_CSP_KEY, "https://*.googletagmanager.com", "https://*.google-analytics.com", "https://*.analytics.google.com");
-            ContentSecurityPolicyFilter.registerAllowedSources(Directive.Image, ANALYTICS_CSP_KEY, "https://www.googletagmanager.com");
+            ContentSecurityPolicyFilter.registerAllowedSources(ANALYTICS_CSP_KEY, Directive.Connection, "https://*.googletagmanager.com", "https://*.google-analytics.com", "https://*.analytics.google.com");
+            ContentSecurityPolicyFilter.registerAllowedSources(ANALYTICS_CSP_KEY, Directive.Image, "https://www.googletagmanager.com");
         }
     }
 
diff --git a/core/src/org/labkey/core/security/AllowedExternalResourceHosts.java b/core/src/org/labkey/core/security/AllowedExternalResourceHosts.java
index a118f7cbf7d..16bbb641d08 100644
--- a/core/src/org/labkey/core/security/AllowedExternalResourceHosts.java
+++ b/core/src/org/labkey/core/security/AllowedExternalResourceHosts.java
@@ -63,7 +63,7 @@ public static void saveAllowedHosts(@Nullable Collection<AllowedHost> allowedHos
 
             // Unregister all supported directives then register the directives that have at least one allowed host
             Arrays.stream(Directive.values()).forEach(dir -> {
-                ContentSecurityPolicyFilter.unregisterAllowedSources(dir, ALLOWED_EXTERNAL_RESOURCES);
+                ContentSecurityPolicyFilter.unregisterAllowedSources(ALLOWED_EXTERNAL_RESOURCES, dir);
                 List<String> list = map.get(dir);
                 if (list != null)
                     ContentSecurityPolicyFilter.registerAllowedSources(ALLOWED_EXTERNAL_RESOURCES, dir, list.toArray(new String[0]));
diff --git a/core/src/org/labkey/core/wiki/HtmlRenderer.java b/core/src/org/labkey/core/wiki/HtmlRenderer.java
index 3dfcc54fff7..8124e9da03f 100644
--- a/core/src/org/labkey/core/wiki/HtmlRenderer.java
+++ b/core/src/org/labkey/core/wiki/HtmlRenderer.java
@@ -23,7 +23,6 @@
 import org.labkey.api.util.HtmlString;
 import org.labkey.api.util.JSoupUtil;
 import org.labkey.api.util.PageFlowUtil;
-import org.labkey.api.view.HttpView;
 import org.labkey.api.view.template.ClientDependency;
 import org.labkey.api.wiki.FormattedHtml;
 import org.labkey.api.wiki.WikiRenderer;
@@ -97,7 +96,7 @@ public FormattedHtml format(String text)
         Document doc = JSoupUtil.convertHtmlToDocument("<html><body>" + StringUtils.trimToEmpty(formattedHtml.getHtml().toString()) + "</body></html>", false, errors);
         if (!errors.isEmpty() || doc == null)
         {
-            StringBuilder innerHtml = new StringBuilder("<div class=\"labkey-error\"><b>An exception occurred while generating the HTML.  Please correct this content.</b></div><br>The error message was: ");
+            StringBuilder innerHtml = new StringBuilder("<div class=\"labkey-error\"><b>An exception occurred while generating the HTML. Please correct this content.</b></div><br>The error message was: ");
             if (!errors.isEmpty())
             {
                 for (String error : errors)
@@ -169,18 +168,10 @@ public FormattedHtml format(String text)
             }
         }
 
-        /* Add nonce attribute to <script> tags in the page.
-         * We don't require the <%=scriptNonce%> syntax (as with module html view), because we're already parsing the page.
-         * ModuleHtmlView does not parse the page and does a raw regexp substitution.
-         */
-        nl = doc.getElementsByTagName("script");
-        for (int i = 0, length = nl.getLength(); i < length; i++)
-        {
-            Element script = (Element)nl.item(i);
-            script.setAttribute("nonce", HttpView.currentPageConfig().getScriptNonce().toString());
+        // Add nonces to all script elements. Mark the page as volatile if any script elements are present. This is a
+        // little heavy-handed.  We could add a "post-render" step instead.
+        if (PageFlowUtil.addScriptNonces(doc) > 0)
             volatilePage = true;
-            /* NOTE marking the page as volatile is a little heavy-handed.  We could add a "post-render" step, or detect that there is not CSP */
-        }
 
         // back to html
         StringBuilder innerHtml;
diff --git a/pipeline/src/org/labkey/pipeline/PipelineModule.java b/pipeline/src/org/labkey/pipeline/PipelineModule.java
index 8a46dd131a5..2c692ed9485 100644
--- a/pipeline/src/org/labkey/pipeline/PipelineModule.java
+++ b/pipeline/src/org/labkey/pipeline/PipelineModule.java
@@ -220,7 +220,7 @@ protected void startupAfterSpringConfig(ModuleContext moduleContext)
 
         AdminConsole.addOptionalFeatureFlag(new AdminConsole.OptionalFeatureFlag(ADVANCED_IMPORT_FLAG,
                 "Restore 'Advanced Import Options' during Folder import",
-                "This option will be removed in LabKey Server v25.7.",
+                "This option will be removed in LabKey Server v25.11.",
                 false, false, OptionalFeatureService.FeatureType.Deprecated
         ));
 
diff --git a/study/src/org/labkey/study/query/StudyQuerySchema.java b/study/src/org/labkey/study/query/StudyQuerySchema.java
index a9a6d105e82..a5fbb61149e 100644
--- a/study/src/org/labkey/study/query/StudyQuerySchema.java
+++ b/study/src/org/labkey/study/query/StudyQuerySchema.java
@@ -16,6 +16,7 @@
 
 package org.labkey.study.query;
 
+import com.google.common.collect.Iterables;
 import org.apache.commons.lang3.StringUtils;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;