Vulnerability

CVE-2025-12390

Medium· 6.0CVSS6EPSS0%

.rules3/5

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.

Threat signal

60/100

Elevated

Severity

medium

CVSS

6.0

EPSS

Active

CVSS

v3.1via NVDOpen in FIRST calculator →

6.0/ 10MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N

Attack VectorLocalRequires local access — shell, console, or local app.
Attack ComplexityHighRequires conditions outside attacker's control (race, brute-force, configuration
Privileges RequiredLowStandard user privileges sufficient.
User InteractionRequiredRequires user action (click, file open, etc).
ScopeUnchangedImpact contained to the vulnerable component.
Confidentiality ImpactHighTotal disclosure of sensitive data.
Integrity ImpactHighTotal compromise of integrity — full data modification possible.
Availability ImpactNoneNo availability impact.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

0.14%

probability of exploitation in next 30 days

higher than 3% of all CVEs

7-day trend↑ 0pp

Low exploitation likelihood — defer if no other signals fire.

Vendor VEX

No VEX statements published for CVE-2025-12390. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCDefer

No exploitation, limited impact or prevalence

exploitation: none
automatable: no
impact: partial
mission: support

Lifecycle

2025-10-28Published
2026-10-18Last modified1 source

CVE-2025-12390

CVSS

EPSS

Vendor VEX

Lifecycle

References

CVE-2025-12390

CVSS

EPSS

Vendor VEX

Lifecycle

References