vulnerability / NVI-00008926 / Revision 4
OpenAM Account Takeover via Unverified Password Change in OAuth2 Module
GitHub lists this reviewed advisory for org.openidentityplatform.openam:openam-auth-oauth2. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
7.4 HIGH (4.0)
security-advisories@github.com severity; no combined Null risk score.
0.669%
FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.52071. Missing scores are unknown.
As of · FIRST EPSS
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
org.openidentityplatform.openam:openam-auth-oauth2
source listed< 16.1.1
## Summary **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 both identifier and password. For pre-existing users whose IdP profile resolves against an existing local identifier, the rewrite fires on the very first re-login. Usernames shorter than the default m
03 / Response
What to do next
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. FIRST EPSS
A fixed release is not deployment evidence.
Check current vendor support and compatibility. After making a change, verify the deployed build and relevant runtime conditions. Keep the evidence, owner and time. An updated lockfile alone does not prove what is running.
04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
- NVD lastModified does not establish freshness of every associated CPE record.
05 / Provenance
Sources you can inspect
Each assertion retains its source. Mirrored records may repeat one underlying publisher; additional links are not independent corroboration.
- GHSA-gf57-4mp6-m85x ↗
GitHub Advisory Database · vendor advisory
Observed . GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.
- CVE-2026-46623 ↗
NIST National Vulnerability Database · official catalog
Observed . This product uses data from the NVD API but is not endorsed or certified by the NVD.
- CVE-2026-46623 ↗
FIRST EPSS · official catalog
Observed . FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.
Public revision history
Only published revisions appear here. Routine fetches do not create a material-change event.
- Revision 4 ·
Source facts changed; compare the preserved prior revision.
- Revision 3 ·
Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.
- Revision 2 ·
Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.
- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.