Skip to content
OpenAdvisories
Critical · 9.1 Public exploit CVE-2026-117691 EUVD-2026-117441GHSA-c85j-3hq2-q6wj

Keycloak-services: keycloak-services: saml redirect binding signature bypass via percent-encoded parameter names

Published Nov 5, 2026 · Updated Nov 7, 2026 · Assigned by redhat

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

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.

Affected products

VendorProductAffectedFixed
Red Hat Red Hat build of Keycloak 26.6 — —
Red Hat Red Hat build of Keycloak 26.6.9 — —
Red Hat Red Hat Single Sign-On 7 — —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

  • foxcornlab/keycloak-saml-scanner ★ 0 · Nov 7, 2026

    Detection-only triage for CVE-2026-117691 (CVSS 9.1): Keycloak SAML HTTP-Redirect binding signature bypass, fixed in 26.8.2

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Advisories 1

References