High, CVSS 8.7MavenAmendedPublished
OpenAM Account Takeover via Unverified Password Change in OAuth2 Module
CVE-2026-46623 · GHSA-gf57-4mp6-m85x
- Affected
- Maven org.openidentityplatform.openam:openam-auth-oauth2 < 16.1.1
- Fixed in
- 16.1.1· Vendor fix available
- Issue
- Description An Unverified Password Change (CWE-620) and Use of Weak Credentials (CWE-1391) issue in OpenAM's OAuth2 authentication module silently rewrites a local user's password to the literal string of their username on OAuth2 re-login of an existing account. The default ldapService chain then accepts the username as the password for that user, allowing an unauthenticated attacker to obtain a session via the standard authenticate endpoint with both username and password set to the username, without any IdP interaction. This affects OpenAM Community Edition through version 16.0.6 and was patched in version 16.1.1. Impact OpenAM Community Edition deployments through version 16.0.6 that use the OAuth2 authentication module with account creation enabled (the default) are potentially affected. After two OAuth logins of a given user, that user's local password becomes their username, and the account is reachable through the default ldapService chain with username as…
Recommended action: Upgrade to 16.1.1 or later, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.