diff --git a/server/middleware/src/index.ts b/server/middleware/src/index.ts
index 33425770bf5..6ed9e98cfe1 100644
--- a/server/middleware/src/index.ts
+++ b/server/middleware/src/index.ts
@@ -40,3 +40,4 @@ export * from './identity'
 export * from './pluginConfig'
 export * from './userStatus'
 export * from './findSecurity'
+export * from './normalizeTx'
diff --git a/server/middleware/src/normalizeTx.ts b/server/middleware/src/normalizeTx.ts
new file mode 100644
index 00000000000..26d241599c9
--- /dev/null
+++ b/server/middleware/src/normalizeTx.ts
@@ -0,0 +1,259 @@
+//
+// Copyright © 2025 Hardcore Engineering Inc.
+//
+// Licensed under the Eclipse Public License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License. You may
+// obtain a copy of the License at https://www.eclipse.org/legal/epl-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+import core, {
+  type MeasureContext,
+  type Tx,
+  type SessionData,
+  type TxApplyIf,
+  type Ref,
+  type Class,
+  type Doc,
+  type Space,
+  type PersonId,
+  TxProcessor,
+  type TxWorkspaceEvent,
+  type OperationDomain,
+  type TxDomainEvent,
+  type TxCUD,
+  type TxModelUpgrade,
+  type TxCreateDoc,
+  type TxUpdateDoc,
+  type TxRemoveDoc,
+  type TxMixin,
+  type Mixin
+} from '@hcengineering/core'
+import platform, { PlatformError, Severity, Status } from '@hcengineering/platform'
+import {
+  BaseMiddleware,
+  type Middleware,
+  type TxMiddlewareResult,
+  type PipelineContext
+} from '@hcengineering/server-core'
+
+// Helper types to require update in validation after Tx types are changed
+type ExplicitUndefined<T> = { [P in keyof Required<T>]: Exclude<T[P], undefined> | Extract<T[P], undefined> }
+type WithIdType<T, I> = Omit<T, '_id'> & { _id: I }
+type ExplicitTx<T> = WithIdType<ExplicitUndefined<T>, Ref<Tx>>
+
+/**
+ * Validates properties in known Tx interfaces and removes unrecognized properties
+ * @public
+ */
+export class NormalizeTxMiddleware extends BaseMiddleware implements Middleware {
+  private constructor (context: PipelineContext, next?: Middleware) {
+    super(context, next)
+  }
+
+  static async create (
+    ctx: MeasureContext,
+    context: PipelineContext,
+    next: Middleware | undefined
+  ): Promise<NormalizeTxMiddleware> {
+    return new NormalizeTxMiddleware(context, next)
+  }
+
+  tx (ctx: MeasureContext<SessionData>, txes: unknown[]): Promise<TxMiddlewareResult> {
+    const parsedTxes = []
+    for (const tx of txes) {
+      const parsedTx = this.parseTx(tx)
+      if (parsedTx === undefined) {
+        throw new PlatformError(new Status(Severity.ERROR, platform.status.BadRequest, {}))
+      }
+      parsedTxes.push(parsedTx)
+    }
+    return this.provideTx(ctx, parsedTxes)
+  }
+
+  private checkMeta (meta: unknown): meta is Record<string, string | number | boolean> | undefined {
+    if (meta === undefined) {
+      return true
+    }
+    if (meta === null || typeof meta !== 'object') {
+      return false
+    }
+    for (const [, val] of Object.entries(meta)) {
+      if (typeof val !== 'string' && typeof val !== 'number' && typeof val !== 'boolean') {
+        return false
+      }
+    }
+    return true
+  }
+
+  private parseBaseTx (source: unknown): ExplicitTx<Tx> | undefined {
+    if (source == null || typeof source !== 'object') {
+      return undefined
+    }
+    const { _class, _id, space, modifiedBy, modifiedOn, createdBy, createdOn, objectSpace, meta } = source as Record<
+    keyof Tx,
+    unknown
+    >
+    const isTxValid =
+      typeof _class === 'string' &&
+      typeof _id === 'string' &&
+      typeof space === 'string' &&
+      typeof modifiedBy === 'string' &&
+      typeof modifiedOn === 'number' &&
+      (createdBy === undefined || typeof createdBy === 'string') &&
+      (createdOn === undefined || typeof createdOn === 'number') &&
+      typeof objectSpace === 'string' &&
+      this.checkMeta(meta)
+    if (!isTxValid) {
+      return undefined
+    }
+    const baseTx: ExplicitTx<Tx> = {
+      _class: _class as Ref<Class<Doc>>,
+      _id: _id as Ref<Tx>,
+      space: space as Ref<Space>,
+      modifiedBy: modifiedBy as PersonId,
+      modifiedOn,
+      createdBy: createdBy as PersonId | undefined,
+      createdOn,
+      objectSpace: objectSpace as Ref<Space>,
+      meta: meta as Record<string, any> | undefined
+    }
+    return baseTx
+  }
+
+  private parseTx (source: unknown): Tx | undefined {
+    const baseTx = this.parseBaseTx(source)
+    if (baseTx === undefined) {
+      return undefined
+    }
+
+    if (TxProcessor.isExtendsCUD(baseTx._class)) {
+      return this.parseTxCUD(source, baseTx)
+    } else if (baseTx._class === core.class.TxWorkspaceEvent) {
+      const { event, params } = source as any
+      if (typeof event !== 'number') {
+        return undefined
+      }
+      const workspaceEvent: ExplicitTx<TxWorkspaceEvent> = Object.assign(baseTx, {
+        event,
+        params
+      })
+      return workspaceEvent
+    } else if (baseTx._class === core.class.TxDomainEvent) {
+      const { domain, event } = source as any
+      if (typeof domain !== 'string') {
+        return undefined
+      }
+      const domainEvent: ExplicitTx<TxDomainEvent> = Object.assign(baseTx, {
+        domain: domain as OperationDomain,
+        event
+      })
+      return domainEvent
+    } else if (baseTx._class === core.class.TxApplyIf) {
+      const { scope, match, notMatch, txes, notify, extraNotify, measureName } = source as Record<
+      keyof TxApplyIf,
+      unknown
+      >
+      const isValid =
+        (scope === undefined || typeof scope === 'string') &&
+        (match === undefined || Array.isArray(match)) &&
+        (notMatch === undefined || Array.isArray(notMatch)) &&
+        Array.isArray(txes) &&
+        (notify === undefined || typeof notify === 'boolean') &&
+        (extraNotify === undefined || Array.isArray(extraNotify)) &&
+        (measureName === undefined || typeof measureName === 'string')
+      if (!isValid) {
+        return undefined
+      }
+      const parsedTxes: TxCUD<Doc>[] = []
+      for (const tx of txes) {
+        const baseChildTx = this.parseBaseTx(tx)
+        if (baseChildTx === undefined || !TxProcessor.isExtendsCUD(baseChildTx._class)) {
+          return undefined
+        }
+        const parsed = this.parseTxCUD(tx, baseChildTx)
+        if (parsed === undefined) {
+          return undefined
+        }
+        parsedTxes.push(parsed as TxCUD<Doc>)
+      }
+      const applyIf: ExplicitTx<TxApplyIf> = Object.assign(baseTx, {
+        scope,
+        match,
+        notMatch,
+        txes: parsedTxes,
+        notify,
+        extraNotify,
+        measureName
+      })
+      return applyIf
+    } else if (baseTx._class === core.class.TxModelUpgrade) {
+      const modelUpgrade: TxModelUpgrade = baseTx
+      return modelUpgrade
+    }
+
+    return undefined
+  }
+
+  private parseTxCUD (source: unknown, base: ExplicitTx<Tx>): ExplicitTx<TxCUD<Doc>> | undefined {
+    const { objectId, objectClass, attachedTo, attachedToClass, collection } = source as Record<
+    keyof TxCUD<Doc>,
+    unknown
+    >
+    const isValid =
+      typeof objectId === 'string' &&
+      typeof objectClass === 'string' &&
+      (attachedTo === undefined || typeof attachedTo === 'string') &&
+      (attachedToClass === undefined || typeof attachedToClass === 'string') &&
+      (collection === undefined || typeof collection === 'string')
+    if (!isValid) {
+      return undefined
+    }
+    const baseCUD: ExplicitTx<TxCUD<Doc>> = Object.assign(base, {
+      objectId: objectId as Ref<Doc>,
+      objectClass: objectClass as Ref<Class<Doc>>,
+      attachedTo: attachedTo as Ref<Doc>,
+      attachedToClass: attachedToClass as Ref<Class<Doc>>,
+      collection
+    })
+    if (baseCUD._class === core.class.TxCreateDoc) {
+      const { attributes } = source as Record<keyof TxCreateDoc<Doc>, unknown>
+      if (typeof attributes !== 'object' || attributes === null) {
+        return undefined
+      }
+      const createDoc: ExplicitTx<TxCreateDoc<Doc>> = Object.assign(baseCUD, { attributes })
+      return createDoc
+    } else if (baseCUD._class === core.class.TxUpdateDoc) {
+      const { operations, retrieve } = source as Record<keyof TxUpdateDoc<Doc>, unknown>
+      if (
+        typeof operations !== 'object' ||
+        operations === null ||
+        (retrieve !== undefined && typeof retrieve !== 'boolean')
+      ) {
+        return undefined
+      }
+      const updateDoc: ExplicitTx<TxUpdateDoc<Doc>> = Object.assign(baseCUD, { operations, retrieve })
+      return updateDoc
+    } else if (baseCUD._class === core.class.TxRemoveDoc) {
+      const removeDoc: ExplicitTx<TxRemoveDoc<Doc>> = baseCUD
+      return removeDoc
+    } else if (baseCUD._class === core.class.TxMixin) {
+      const { mixin, attributes } = source as Record<keyof TxMixin<Doc, Doc>, unknown>
+      if (typeof mixin !== 'string' || typeof attributes !== 'object' || attributes === null) {
+        return undefined
+      }
+      const txMixin: ExplicitTx<TxMixin<Doc, Doc>> = Object.assign(baseCUD, {
+        mixin: mixin as Ref<Mixin<Doc>>,
+        attributes
+      })
+      return txMixin
+    } else {
+      return undefined
+    }
+  }
+}
diff --git a/server/server-pipeline/src/pipeline.ts b/server/server-pipeline/src/pipeline.ts
index bffe65d265d..d2e1a32347c 100644
--- a/server/server-pipeline/src/pipeline.ts
+++ b/server/server-pipeline/src/pipeline.ts
@@ -40,7 +40,8 @@ import {
   TriggersMiddleware,
   TxMiddleware,
   UserStatusMiddleware,
-  GuestPermissionsMiddleware
+  GuestPermissionsMiddleware,
+  NormalizeTxMiddleware
 } from '@hcengineering/middleware'
 import {
   createBenchmarkAdapter,
@@ -118,6 +119,7 @@ export function createServerPipeline (
 
     const middlewares: MiddlewareCreator[] = [
       LookupMiddleware.create,
+      NormalizeTxMiddleware.create,
       IdentityMiddleware.create,
       ModifiedMiddleware.create,
       FindSecurityMiddleware.create,