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
Affected Vendors & Products
References
History
Sat, 07 Nov 2026 15:45:00 +0000
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| CPEs | ||
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Sat, 07 Nov 2026 15:00:00 +0000
| Type | Values Removed | Values Added |
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| CPEs | cpe:/a:redhat:build_keycloak:26.6::el9 | |
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Fri, 06 Nov 2026 00:15:00 +0000
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threat_severity
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threat_severity
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Thu, 05 Nov 2026 17:30:00 +0000
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| Metrics |
ssvc
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Thu, 05 Nov 2026 17:15:00 +0000
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| First Time appeared |
Red Hat
Red Hat red Hat Build Of Keycloak 26.4 Redhat build Of Keycloak Redhat single Sign-on |
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| Vendors & Products |
Red Hat
Red Hat red Hat Build Of Keycloak 26.4 Redhat build Of Keycloak Redhat single Sign-on |
Thu, 05 Nov 2026 13:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Keycloak-services: keycloak-services: saml redirect binding signature bypass via percent-encoded parameter names | |
| First Time appeared |
Redhat
Redhat build Keycloak Redhat red Hat Single Sign On |
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| Weaknesses | CWE-347 | |
| CPEs | cpe:/a:redhat:build_keycloak: cpe:/a:redhat:red_hat_single_sign_on:7 |
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| Vendors & Products |
Redhat
Redhat build Keycloak Redhat red Hat Single Sign On |
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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: redhat
Published: 2026-11-05T13:27:23.748Z
Updated: 2026-11-07T15:39:27.366Z
Reserved: 2026-10-27T13:49:55.445Z
Link: CVE-2026-117691
Updated: 2026-11-05T16:28:29.946Z
Status : Undergoing Analysis
Published: 2026-11-05T14:17:01.320
Modified: 2026-11-07T16:16:39.990
Link: CVE-2026-117691