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Advisory severityMedium6.0Red Hat Linux

Medium [CVE-2025-12390] Org.keycloak.protocol.oidc.endpoints.logoutendpoint: offline session takeover due to reused authentication session id

This medium-severity Red Hat Linux advisory covers CVE-2025-12390 affecting Red Hat build of Keycloak 26.2.11, Red Hat build of Keycloak 26.4.4.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2025-12390 Source published Source updated

VulniPulse record published

CVE-2025-12390
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

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Summary

A flaw was found in Keycloak. In Keycloak where a user can accidentally get access to another user's session if both use the same device and browser.

This happens because Keycloak sometimes reuses session identifiers and doesn’t clean up properly during logout when browser cookies are missing. As a result, one user may receive tokens that belong to another user.

Red Hat severity: Moderate — CVSS 6 (CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N). Weakness: CWE-384.

Affected Red Hat products: Red Hat build of Keycloak 26.2; Red Hat build of Keycloak 26.2.11; Red Hat build of Keycloak 26.4; Red Hat build of Keycloak 26.4.4. Red Hat fixing advisory: RHSA-2025:22088, RHSA-2025:22089, RHSA-2025:21371, RHSA-2025:21370.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.

Official advisory · high-confidence parse· fetched 17 days ago·verify at source

Fixed versions
  • rhbk/keycloak-operator-bundle:26.2.11-1
  • rhbk/keycloak-rhel9:26.2-12
  • rhbk/keycloak-rhel9-operator:26.2-12
  • rhbk/keycloak-operator-bundle:26.4.4-1
  • rhbk/keycloak-rhel9:26.4-3
  • rhbk/keycloak-rhel9-operator:26.4-3
  • keycloak
  • RHSA-2025:22088
  • RHSA-2025:22089
  • RHSA-2025:21371
  • RHSA-2025:21370

Official advisory · high-confidence parse· fetched 17 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Official advisory · high-confidence parse· fetched 17 days ago·verify at source

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