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6.0 Medium

CVE-2025-12390 A flaw was found in Keycloak

Description

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.

Affected products and versions

Product Affected versions Fixed in
keycloak 26.0 earliest → < 26.0.0 26.0.0
Red Hat build of Keycloak 26.2 26.2 earliest → < 26.2-12 26.2-12
Red Hat build of Keycloak 26.2.11 Versions not published
Red Hat build of Keycloak 26.4 26.4 earliest → < 26.4-3 26.4-3
Red Hat build of Keycloak 26.4.4 Versions not published

Other CVEs of keycloak

The 15 CVEs of keycloak →
CVE-2026-90997 A flaw was found in Keycloak 7.4 High CVE-2026-1609 A flaw was found in Keycloak 8.1 High CVE-2025-12150 A flaw was found in Keycloak’s WebAuthn registration component 3.1 Low CVE-2025-13467 A flaw was found in the Keycloak LDAP User Federation provider 5.5 Medium
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