OpenIdentityPlatform OpenAM up to 16.1.0 OAuth2 Authentication improper authentication

Summaryinfo

A vulnerability categorized as critical has been discovered in OpenIdentityPlatform OpenAM up to 16.1.0. This affects an unknown function of the component OAuth2 Authentication Module. Executing a manipulation can lead to improper authentication. The identification of this vulnerability is CVE-2026-46623. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in OpenIdentityPlatform OpenAM up to 16.1.0 and classified as critical. This vulnerability affects an unknown functionality of the component OAuth2 Authentication Module. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-46623 since 05/15/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available.

Upgrading to version 16.1.1 eliminates this vulnerability.

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Productinfo

Vendor

• OpenIdentityPlatform

Name

• OpenAM

Version

• 16.0
• 16.1.0

Website

• Product: https://github.com/OpenIdentityPlatform/OpenAM/

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