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CVE PROGRAM SOURCE RECORD9.1 Critical

CVE-2026-117691

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

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Status
Published
Published
Updated
Assigning organization
redhat

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

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Red Hat Red Hat build of Keycloak 26.6

Default version status: affected

  • 26.6.9-1 to < *unaffected

Red Hat Red Hat build of Keycloak 26.6

Default version status: affected

  • 26.6-25 to < *unaffected

Red Hat Red Hat build of Keycloak 26.6

Default version status: affected

  • 26.6-26 to < *unaffected

Red Hat Red Hat build of Keycloak 26.6.9

Default version status: unaffected

Red Hat Red Hat build of Keycloak 26.6.9

Default version status: unaffected

Red Hat Red Hat Single Sign-On 7

Default version status: unaffected

References