diff --git a/contracts/events/src/tests/admin.rs b/contracts/events/src/tests/admin.rs
index 20f2036..def308a 100644
--- a/contracts/events/src/tests/admin.rs
+++ b/contracts/events/src/tests/admin.rs
@@ -3,8 +3,8 @@
 #![cfg(test)]
 
 use soroban_sdk::{
-    testutils::{BytesN as _, Ledger},
-    BytesN, String,
+    testutils::{Address as _, BytesN as _, Ledger},
+    Address, BytesN, String,
 };
 
 use super::common::setup;
@@ -170,3 +170,156 @@ fn migrate_marks_current_version_and_blocks_replay() {
         .unwrap();
     assert_eq!(err, Error::MigrationAlreadyApplied);
 }
+
+// AUTH REGRESSION GUARDS (#73)
+//
+// setup() mocks all auths for every address, so a call succeeding is not
+// proof that require_admin() ran — it succeeds identically whether the
+// check is present or was deleted. These tests replace the mock with an
+// empty auth set so the call can only succeed if the contract explicitly
+// requests and receives the admin's authorization. If require_admin() is
+// ever removed from one of these entrypoints, the call stops requesting
+// auth altogether and runs to completion instead of failing here,
+// turning the test red.
+
+#[test]
+fn pause_reverts_without_admin_auth() {
+    let ctx = setup(250);
+    ctx.env.mock_auths(&[]);
+    let err = ctx.client.try_pause();
+    assert!(err.is_err(), "pause must require admin auth");
+}
+
+#[test]
+fn unpause_reverts_without_admin_auth() {
+    let ctx = setup(250);
+    ctx.client.pause();
+    ctx.env.mock_auths(&[]);
+    let err = ctx.client.try_unpause();
+    assert!(err.is_err(), "unpause must require admin auth");
+}
+
+#[test]
+fn set_admin_reverts_without_admin_auth() {
+    let ctx = setup(250);
+    let new_admin = Address::generate(&ctx.env);
+    ctx.env.mock_auths(&[]);
+    let err = ctx.client.try_set_admin(&new_admin);
+    assert!(err.is_err(), "set_admin must require admin auth");
+}
+
+#[test]
+fn set_fee_bps_reverts_without_admin_auth() {
+    let ctx = setup(250);
+    ctx.env.mock_auths(&[]);
+    let err = ctx.client.try_set_fee_bps(&300);
+    assert!(err.is_err(), "set_fee_bps must require admin auth");
+}
+
+#[test]
+fn set_fee_account_reverts_without_admin_auth() {
+    let ctx = setup(250);
+    let new_account = Address::generate(&ctx.env);
+    ctx.env.mock_auths(&[]);
+    let err = ctx.client.try_set_fee_account(&new_account);
+    assert!(err.is_err(), "set_fee_account must require admin auth");
+}
+
+#[test]
+fn set_profile_contract_reverts_without_admin_auth() {
+    let ctx = setup(250);
+    let new_profile = Address::generate(&ctx.env);
+    ctx.env.mock_auths(&[]);
+    let err = ctx.client.try_set_profile_contract(&new_profile);
+    assert!(err.is_err(), "set_profile_contract must require admin auth");
+}
+
+#[test]
+fn propose_upgrade_reverts_without_admin_auth() {
+    let ctx = setup(250);
+    let new_hash: BytesN<32> = BytesN::random(&ctx.env);
+    let new_version = String::from_str(&ctx.env, "0.3.0");
+    ctx.env.mock_auths(&[]);
+    let err = ctx.client.try_propose_upgrade(&new_hash, &new_version);
+    assert!(err.is_err(), "propose_upgrade must require admin auth");
+}
+
+#[test]
+fn apply_upgrade_reverts_without_admin_auth() {
+    let ctx = setup(250);
+    let new_hash: BytesN<32> = BytesN::random(&ctx.env);
+    let new_version = String::from_str(&ctx.env, "0.3.0");
+    ctx.client.propose_upgrade(&new_hash, &new_version);
+
+    ctx.env.ledger().with_mut(|li| {
+        li.sequence_number += UPGRADE_TIMELOCK_LEDGERS;
+    });
+
+    ctx.env.mock_auths(&[]);
+    let err = ctx.client.try_apply_upgrade();
+    assert!(err.is_err(), "apply_upgrade must require admin auth");
+}
+
+#[test]
+fn cancel_pending_upgrade_reverts_without_admin_auth() {
+    let ctx = setup(250);
+    let new_hash: BytesN<32> = BytesN::random(&ctx.env);
+    let new_version = String::from_str(&ctx.env, "0.3.0");
+    ctx.client.propose_upgrade(&new_hash, &new_version);
+
+    ctx.env.mock_auths(&[]);
+    let err = ctx.client.try_cancel_pending_upgrade();
+    assert!(
+        err.is_err(),
+        "cancel_pending_upgrade must require admin auth"
+    );
+}
+
+#[test]
+fn migrate_reverts_without_admin_auth() {
+    let ctx = setup(250);
+    ctx.env.mock_auths(&[]);
+    let err = ctx.client.try_migrate();
+    assert!(err.is_err(), "migrate must require admin auth");
+}
+
+// ============================================================
+// ACCEPT_ADMIN — target-auth guard
+//
+// accept_admin does not call require_admin(); it authorizes against the
+// pending target address instead (pending.target.require_auth()). These
+// two tests prove that guard independently of the require_admin() guards
+// above: the empty-mock test shows *some* auth is demanded, and the
+// auths() check shows it is demanded from the pending target
+// specifically, not just any address mock_all_auths() happens to cover.
+// ============================================================
+
+#[test]
+fn accept_admin_reverts_without_targets_auth() {
+    let ctx = setup(250);
+    let new_admin = Address::generate(&ctx.env);
+    ctx.client.set_admin(&new_admin);
+
+    ctx.env.mock_auths(&[]);
+    let err = ctx.client.try_accept_admin();
+    assert!(
+        err.is_err(),
+        "accept_admin must require the pending target's auth"
+    );
+}
+
+#[test]
+fn accept_admin_demands_pending_targets_auth_specifically() {
+    let ctx = setup(250);
+    let new_admin = Address::generate(&ctx.env);
+    ctx.client.set_admin(&new_admin);
+
+    ctx.client.accept_admin();
+
+    let auths = ctx.env.auths();
+    let target_required = auths.iter().any(|(addr, _)| *addr == new_admin);
+    assert!(
+        target_required,
+        "accept_admin must demand the pending target's own auth"
+    );
+}
diff --git a/contracts/profile/src/tests/admin.rs b/contracts/profile/src/tests/admin.rs
index bcb2b0a..5c1bfd7 100644
--- a/contracts/profile/src/tests/admin.rs
+++ b/contracts/profile/src/tests/admin.rs
@@ -250,3 +250,186 @@ fn migrate_marks_version_and_blocks_replay_profile() {
         .unwrap();
     assert_eq!(err, Error::MigrationAlreadyApplied);
 }
+
+// ============================================================
+// AUTH REGRESSION GUARDS (#73)
+//
+// Mirror of the events-contract guards in
+// contracts/events/src/tests/admin.rs — see that file for the rationale.
+// ============================================================
+
+#[test]
+fn pause_reverts_without_admin_auth() {
+    let ctx = setup();
+    ctx.env.mock_auths(&[]);
+    let err = ctx.client.try_pause();
+    assert!(err.is_err(), "pause must require admin auth");
+}
+
+#[test]
+fn unpause_reverts_without_admin_auth() {
+    let ctx = setup();
+    ctx.client.pause();
+    ctx.env.mock_auths(&[]);
+    let err = ctx.client.try_unpause();
+    assert!(err.is_err(), "unpause must require admin auth");
+}
+
+#[test]
+fn set_admin_reverts_without_admin_auth() {
+    let ctx = setup();
+    let new_admin = Address::generate(&ctx.env);
+    ctx.env.mock_auths(&[]);
+    let err = ctx.client.try_set_admin(&new_admin);
+    assert!(err.is_err(), "set_admin must require admin auth");
+}
+
+#[test]
+fn set_events_contract_reverts_without_admin_auth() {
+    let ctx = setup();
+    let events = Address::generate(&ctx.env);
+    ctx.env.mock_auths(&[]);
+    let err = ctx.client.try_set_events_contract(&events);
+    assert!(err.is_err(), "set_events_contract must require admin auth");
+}
+
+#[test]
+fn propose_events_contract_reverts_without_admin_auth() {
+    let ctx = setup();
+    let events_a = Address::generate(&ctx.env);
+    ctx.client.set_events_contract(&events_a);
+
+    let events_b = Address::generate(&ctx.env);
+    ctx.env.mock_auths(&[]);
+    let err = ctx.client.try_propose_events_contract(&events_b);
+    assert!(
+        err.is_err(),
+        "propose_events_contract must require admin auth"
+    );
+}
+
+#[test]
+fn accept_events_contract_reverts_without_admin_auth() {
+    let ctx = setup();
+    let events_a = Address::generate(&ctx.env);
+    ctx.client.set_events_contract(&events_a);
+    let events_b = Address::generate(&ctx.env);
+    let start = ctx.env.ledger().sequence();
+    ctx.client.propose_events_contract(&events_b);
+    ctx.env.ledger().with_mut(|li| {
+        li.sequence_number = start + EVENTS_CONTRACT_TIMELOCK_LEDGERS + 1;
+    });
+
+    ctx.env.mock_auths(&[]);
+    let err = ctx.client.try_accept_events_contract();
+    assert!(
+        err.is_err(),
+        "accept_events_contract must require admin auth"
+    );
+}
+
+#[test]
+fn cancel_pending_events_contract_reverts_without_admin_auth() {
+    let ctx = setup();
+    let events_a = Address::generate(&ctx.env);
+    ctx.client.set_events_contract(&events_a);
+    let events_b = Address::generate(&ctx.env);
+    ctx.client.propose_events_contract(&events_b);
+
+    ctx.env.mock_auths(&[]);
+    let err = ctx.client.try_cancel_pending_events_contract();
+    assert!(
+        err.is_err(),
+        "cancel_pending_events_contract must require admin auth"
+    );
+}
+
+#[test]
+fn propose_upgrade_reverts_without_admin_auth() {
+    let ctx = setup();
+    let new_hash: BytesN<32> = BytesN::random(&ctx.env);
+    let new_version = String::from_str(&ctx.env, "0.3.0");
+    ctx.env.mock_auths(&[]);
+    let err = ctx.client.try_propose_upgrade(&new_hash, &new_version);
+    assert!(err.is_err(), "propose_upgrade must require admin auth");
+}
+
+#[test]
+fn apply_upgrade_reverts_without_admin_auth() {
+    let ctx = setup();
+    let new_hash: BytesN<32> = BytesN::random(&ctx.env);
+    let new_version = String::from_str(&ctx.env, "0.3.0");
+    ctx.client.propose_upgrade(&new_hash, &new_version);
+
+    ctx.env.ledger().with_mut(|li| {
+        li.sequence_number += UPGRADE_TIMELOCK_LEDGERS;
+    });
+
+    ctx.env.mock_auths(&[]);
+    let err = ctx.client.try_apply_upgrade();
+    assert!(err.is_err(), "apply_upgrade must require admin auth");
+}
+
+#[test]
+fn cancel_pending_upgrade_reverts_without_admin_auth() {
+    let ctx = setup();
+    let new_hash: BytesN<32> = BytesN::random(&ctx.env);
+    let new_version = String::from_str(&ctx.env, "0.3.0");
+    ctx.client.propose_upgrade(&new_hash, &new_version);
+
+    ctx.env.mock_auths(&[]);
+    let err = ctx.client.try_cancel_pending_upgrade();
+    assert!(
+        err.is_err(),
+        "cancel_pending_upgrade must require admin auth"
+    );
+}
+
+#[test]
+fn migrate_reverts_without_admin_auth() {
+    let ctx = setup();
+    ctx.env.mock_auths(&[]);
+    let err = ctx.client.try_migrate();
+    assert!(err.is_err(), "migrate must require admin auth");
+}
+
+// ============================================================
+// ACCEPT_ADMIN — target-auth guard
+//
+// accept_admin does not call require_admin(); it authorizes against the
+// pending target address instead (pending.target.require_auth()). These
+// two tests prove that guard independently of the require_admin() guards
+// above: the empty-mock test shows *some* auth is demanded, and the
+// auths() check shows it is demanded from the pending target
+// specifically, not just any address mock_all_auths() happens to cover.
+// ============================================================
+
+#[test]
+fn accept_admin_reverts_without_targets_auth() {
+    let ctx = setup();
+    let new_admin = Address::generate(&ctx.env);
+    ctx.client.set_admin(&new_admin);
+
+    ctx.env.mock_auths(&[]);
+    let err = ctx.client.try_accept_admin();
+    assert!(
+        err.is_err(),
+        "accept_admin must require the pending target's auth"
+    );
+}
+
+#[test]
+fn accept_admin_demands_pending_targets_auth_specifically() {
+    let ctx = setup();
+    let new_admin = Address::generate(&ctx.env);
+    ctx.client.set_admin(&new_admin);
+
+    ctx.client.accept_admin();
+
+    let auths = ctx.env.auths();
+    let target_required = auths.iter().any(|(addr, _)| *addr == new_admin);
+    assert!(
+        target_required,
+        "accept_admin must demand the pending target's own auth"
+    );
+}
diff --git a/contracts/profile/src/tests/reputation.rs b/contracts/profile/src/tests/reputation.rs
index 8274625..cc47fe3 100644
--- a/contracts/profile/src/tests/reputation.rs
+++ b/contracts/profile/src/tests/reputation.rs
@@ -418,3 +418,19 @@ fn admin_slash_rejects_non_admin_caller() {
         .try_admin_slash_reputation(&user, &1, &admin_reason(&ctx), &op_id(&ctx));
     assert!(res.is_err(), "non-admin admin_slash must be rejected");
 }
+
+#[test]
+fn admin_slash_demands_admins_auth_specifically() {
+    // Complements admin_slash_rejects_non_admin_caller above (already in
+    // the codebase since #60): that test proves *some* auth is required;
+    // this one proves the auth demanded under a normal call is
+    // specifically the admin's, not just any address mock_all_auths()
+    // happens to approve.
+    let (ctx, user) = setup_with_user();
+    ctx.client
+        .admin_slash_reputation(&user, &1, &admin_reason(&ctx), &op_id(&ctx));
+
+    let auths = ctx.env.auths();
+    let admin_required = auths.iter().any(|(addr, _)| *addr == ctx.admin);
+    assert!(admin_required, "admin_slash must demand the admin's auth");
+}