Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://access.redhat.com/errata/RHSA-2026:53644
- https://access.redhat.com/errata/RHSA-2026:53645
- https://access.redhat.com/errata/RHSA-2026:53646
- https://access.redhat.com/errata/RHSA-2026:53806
- https://access.redhat.com/security/cve/CVE-2026-15556
- https://bugzilla.redhat.com/show_bug.cgi?id=2483121
FAQ
What is CVE-2026-15556?
CVE-2026-15556 is a vulnerability with a CVSS score of 8.1 (HIGH). 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...
How severe is CVE-2026-15556?
CVE-2026-15556 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-15556?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.