CVE-2026-123540 OpenAM before 16.1.4 Incomplete Attribute Encoding in SAML 1.x Form POST
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-123540?
CVE-2026-123540 is a low-severity vulnerability in OpenIdentityPlatform OpenAM, published on 8 Nov 2026.
Official description
OpenAM before 16.1.4 contains an incomplete output encoding vulnerability that allows a SAML 1.x identity provider to alter attribute values by injecting unencoded content into the service provider auto-submitted form. Attackers controlling a trusted identity provider can craft assertion attribute names or values that reach the target application in modified form, undermining the integrity of received attributes.
Weakness: CWE-116
Which versions are affected by CVE-2026-123540?
How do I fix CVE-2026-123540?
No fix has been published for CVE-2026-123540 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-123540 being exploited?
There is no known exploitation of CVE-2026-123540 in the wild and no public exploit code.
Sources
Also known as GHSA-gp9c-wgqc-wwg3, GHSA-pw99-8h4m-p3gm.