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AWS singlesignon medium security documentation change

Service: singlesignon · 2026-07-04 · Security-related medium

File: singlesignon/latest/userguide/provision-automatically.md

Summary

Added note requiring SAML Subject NameID to match SCIM username mapping to prevent sign-in failures

Security assessment

The change addresses authentication misconfiguration that could cause sign-in failures. Ensuring consistent username mapping prevents potential account lockouts or unauthorized access attempts when attributes mismatch, directly impacting authentication security.

Diff

diff --git a/singlesignon/latest/userguide/provision-automatically.md b/singlesignon/latest/userguide/provision-automatically.md
index d5596f4ea..a2ec25337 100644
--- a//singlesignon/latest/userguide/provision-automatically.md
+++ b//singlesignon/latest/userguide/provision-automatically.md
@@ -47,0 +48,2 @@ Before you begin deploying SCIM, we recommend that you first review the followin
+  * For SCIM-provisioned users, make sure the attribute your IdP sends as the SAML `Subject` `NameID` is the same attribute you map to **Username** in your SCIM configuration. If they differ, sign-in fails.
+