CVE-2026-46623 OpenAM Account Takeover via Unverified Password Change in OAuth2 Module
Unauthenticated attackers can take over local accounts by exploiting missing attribute filtering in the OAuth2 module when account creation is enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-46623?
CVE-2026-46623 is a high-severity authentication bypass vulnerability in OpenIdentityPlatform OpenAM, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Open Access Management (OpenAM) is an access management solution. Prior to 16.1.1, the OAuth2 authentication module updates an existing local account with profile attributes that can include userPassword and inetUserStatus, rewriting the password to the username and reactivating disabled accounts. The missing OAuth.removeRestrictedAccountUpdateAttributes filtering permits these credential and status fields to reach the account update. With account creation enabled, repeated OAuth login causes the default ldapService chain to accept the username as both identifier and password, allowing an unauthenticated attacker to take over the local account without interacting with the identity provider. The rewrite can be denied for usernames shorter than the configured minimum password length. This issue is fixed in version 16.1.1.
Which versions are affected by CVE-2026-46623?
2 open source packages ship an affected version, including org.openidentityplatform.openam:openam-auth-oauth2.
| Package | Affected | Fixed in |
|---|---|---|
org.openidentityplatform.openam:openam-auth-oauth2 Maven | All versions | 16.1.1 |
org.openidentityplatform.openam:openam-auth-oauth2 Maven | All versions | 16.1.1 |
How do I fix CVE-2026-46623?
Upgrade org.openidentityplatform.openam:openam-auth-oauth2 to 16.1.1 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-46623 being exploited?
There is no known exploitation of CVE-2026-46623 in the wild and no public exploit code.
Sources
Also known as GHSA-gf57-4mp6-m85x, UBUNTU-CVE-2026-46623.