EUVD-2026-12688
GHSA-wmxr-6j5f-838p
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L
Lifecycle Timeline
4Tags
Description
A flaw was found in Keycloak. Keycloak's Security Assertion Markup Language (SAML) broker endpoint does not properly validate encrypted assertions when the overall SAML response is not signed. An attacker with a valid signed SAML assertion can exploit this by crafting a malicious SAML response. This allows the attacker to inject an encrypted assertion for an arbitrary principal, leading to unauthorized access and potential information disclosure.
Analysis
Keycloak's SAML broker endpoint contains a validation flaw that allows attackers with a valid signed SAML assertion to inject encrypted assertions for arbitrary principals when the overall SAML response is unsigned. This leads to authentication bypass and unauthorized access to protected resources. …
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Remediation
Within 24 hours: Audit all Keycloak SAML broker configurations to identify affected deployments; notify security teams and prepare incident response procedures. Within 7 days: Implement network segmentation to restrict SAML broker endpoint access and enable enhanced logging on authentication events; assess whether SAML response signing enforcement is currently enabled. …
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Priority Score
Vendor Status
Debian
Bug #1088287| Release | Status | Fixed Version | Urgency |
|---|---|---|---|
| open | - | - |
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External POC / Exploit Code
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