CVE-2025-11429: Keycloak-server: too long and not settings compliant session

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-10-23 · updated 2026-10-18
Weakness: CWE-613

Description

A flaw was found in Keycloak. Keycloak does not immediately enforce the disabling of the "Remember Me" realm setting on existing user sessions. Sessions created while "Remember Me" was active retain their extended session lifetime until they expire, overriding the administrator's recent security configuration change. This is a logic flaw in session management increases the potential window for successful session hijacking or unauthorized long-term access persistence. The flaw lies in the session expiration logic relying on the session-local "remember-me" flag without validating the current realm-level configuration.

Affected products

Red Hat build of Keycloak 26.4: all versions — fixed in 26.2-12, 26.2.11-1
Keycloak: before 26.4.1 — fixed in 26.4.1

How to fix

Upgrade to a fixed version: Red Hat build of Keycloak 26.4 26.2-12, 26.2.11-1; Keycloak 26.4.1. Check the vendor advisory for mitigations.

References

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