CVE-2026-117691

CriticalCVSS 9.1/10Last modified Nov 7, 2026

Description

A flaw was found in the SAML HTTP-Redirect binding implementation of Keycloak. The issue occurs because the server processes percent-encoded parameter names (like %53AMLResponse) while the signature verification logic only checks literal parameter names. An attacker can use this discrepancy to provide a crafted, unsigned SAML message that the server processes instead of a legitimately signed one, leading to full account takeover of federated users.

Metrics

CVSS 3.1 9.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-347

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
Red Hat	Red Hat build of Keycloak 26.6	—
Red Hat	Red Hat build of Keycloak 26.6	—
Red Hat	Red Hat build of Keycloak 26.6	—
Red Hat	Red Hat build of Keycloak 26.6.9	—
Red Hat	Red Hat build of Keycloak 26.6.9	—
Red Hat	Red Hat Single Sign-On 7	—

References

Timeline

Published: Nov 5, 2026
Last modified: Nov 7, 2026
NVD status: Undergoing Analysis

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