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Vulnerabilities

Vulnerability · CVE-2025-12390

A flaw was found in Keycloak.

Published Oct 28, 2025 · catalog updated Jul 30, 2026 · Red Hat Red Hat build of Keycloak 26.4

Last checked Oct 27, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-12390. EPSS is 0.14%. Act only if a listed version of Red Hat Red Hat build of Keycloak 26.4 is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium6.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.14%
Remediation
Advisory link
Affected products
vendor Red Hat Red Hat build of Keycloak 26.4 patch: 26.4.4-1

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Red Hat Red Hat build of Keycloak 26.4 patch: 26.4.4-1patch: 26.4.4-1

How to fix CVE-2025-12390

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-12390. EPSS is 0.14%. Act only if a listed version of Red Hat Red Hat build of Keycloak 26.4 is installed.

Which versions are affected?

Compare what you have installed with Red Hat Red Hat build of Keycloak 26.4 patch: 26.4.4-1 patch: 26.4.4-1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.14%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 28, 2025 · EUVD

    Detected

    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.

  2. Jul 30, 2026 · EUVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2025-12390

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-12390

    30-day exploitation probability 0.14%

    first.org
  • EUVDVulnerability recordEUVD-2025-36502

    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 cookie

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 27, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 27, 2026
  • CVE.orgOct 23, 2026
  • EUVDOct 23, 2026