VulnerabilityDeferred
CVE-2025-12390
This happens because Keycloak sometimes reuses session identifiers and doesn’t clean up properly during logout when browser cookies are missing.
MEDIUM 6.0EPSS 0.13%
Does this matter?
Lower severity and a low EPSS score (0.13%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 6.0 MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
- EPSS
- 0.13% probability · 3th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-384
- Source
- secalert@redhat.com
References
- https://access.redhat.com/errata/RHSA-2025:21370
- https://access.redhat.com/errata/RHSA-2025:21371
- https://access.redhat.com/errata/RHSA-2025:22088
- https://access.redhat.com/errata/RHSA-2025:22089
- https://access.redhat.com/security/cve/CVE-2025-12390
- https://bugzilla.redhat.com/show_bug.cgi?id=2406793
- https://github.com/keycloak/keycloak/issues/43853
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.