CVE-2026-123538 OpenAM before 16.1.4 SAML 1.x Signature Verification Issuer Impersonation
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-123538?
CVE-2026-123538 is a high-severity vulnerability in OpenIdentityPlatform OpenAM, published on 8 Nov 2026.
Official description
OpenAM before 16.1.4 does not verify that a signed SAML 1.x assertion or response was signed by the partner named as its issuer, accepting a signature from any certificate in OpenAM's keystore. An attacker holding such a private key, such as a trusted SAML 1.x partner, can forge assertions claiming another partner's issuer and sign in as that partner's users, including privileged ones.
Weakness: CWE-347
Which versions are affected by CVE-2026-123538?
How do I fix CVE-2026-123538?
No fix has been published for CVE-2026-123538 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-123538 being exploited?
There is no known exploitation of CVE-2026-123538 in the wild and no public exploit code.
Sources
Also known as GHSA-9cfm-rxfw-m9h6, GHSA-j56q-q3r3-hg7f.