CVE-2026-117691
A flaw was found in the SAML HTTP-Redirect binding implementation of Keycloak
- Risk score
- 60/100
- CVSS
- 9.1 v3.1
- Published
- 5 Nov 2026
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What to know
- What it is
- 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, unsig…
- Affected
- See advisory
- Fix
- Apply the vendor's security update; see the linked advisory.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 9.1 critical
- Remotely exploitable without logging in
References
Original 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.
Last activity 5 Nov 2026. Patch Forecast updates every hour.