How severe is CVE-2025-12390?

CVE-2025-12390 has a CVSS 3.x base score of 6.0, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2025-12390 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-12390?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-12390 have an EU (EUVD) identifier?

Yes. CVE-2025-12390 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-36502.

When was CVE-2025-12390 published?

CVE-2025-12390 was published on 2025-10-28 and last updated on 2026-06-17.

CVE-2025-12390

CVE-2025-12390 is a medium-severity vulnerability with a CVSS 3.x base score of 6.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-384.

Key facts

Severity: Medium (CVSS 3.x base score 6.0)
EPSS exploit prediction: 0% (3rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-36502
Weakness: CWE-384
Published: 2025-10-28
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-12390?: 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.
How severe is CVE-2025-12390?: CVE-2025-12390 has a CVSS 3.x base score of 6.0, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2025-12390 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-12390?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-12390 have an EU (EUVD) identifier?: Yes. CVE-2025-12390 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-36502.
When was CVE-2025-12390 published?: CVE-2025-12390 was published on 2025-10-28 and last updated on 2026-06-17.

References

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