CVE-2026-15556 Picketlink-federation: picketlink saml 2.0 auth bypass via missing assertions
Attackers can forge SAML responses to bypass authentication and gain unauthorized access with any role in JBoss EAP applications.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-15556?
CVE-2026-15556 is a high-severity authentication bypass vulnerability in Red Hat JBoss Enterprise Application Platform 7, published on 11 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A flaw was found in Picketlink's SP signature validation; a SAML response containing zero assertion elements matching the signature check can allow an attacker to forge a SAML response and auth as any principal with any roles on the protected application.
Weakness: CWE-347
Which versions are affected by CVE-2026-15556?
How do I fix CVE-2026-15556?
Apply the vendor's patch.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-15556 being exploited?
There is no known exploitation of CVE-2026-15556 in the wild and no public exploit code.
Sources
Also known as GHSA-vw9v-mpfh-qwg3.