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CVE Vulnerability Details :
CVE-2025-12390
PUBLISHED
More InfoOfficial Page
Assigner-redhat
Assigner Org ID-53f830b8-0a3f-465b-8143-3b8a9948e749
View Known Exploited Vulnerability (KEV) details
Published At-28 Oct, 2025 | 13:23
Updated At-06 Jan, 2026 | 14:46
Rejected At-
▼CVE Numbering Authority (CNA)
Org.keycloak.protocol.oidc.endpoints.logoutendpoint: offline session takeover due to reused authentication session id

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
Vendor
Keycloak
Product
keycloak
Collection URL
https://github.com/keycloak/keycloak
Package Name
keycloak
Default Status
unaffected
Versions
Affected
  • From 0 before 26.0.0 (semver)
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat build of Keycloak 26.2
Collection URL
https://catalog.redhat.com/software/containers/
Package Name
rhbk/keycloak-operator-bundle
CPEs
  • cpe:/a:redhat:build_keycloak:26.2::el9
Default Status
affected
Versions
Unaffected
  • From 26.2.11-1 before * (rpm)
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat build of Keycloak 26.2
Collection URL
https://catalog.redhat.com/software/containers/
Package Name
rhbk/keycloak-rhel9
CPEs
  • cpe:/a:redhat:build_keycloak:26.2::el9
Default Status
affected
Versions
Unaffected
  • From 26.2-12 before * (rpm)
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat build of Keycloak 26.2
Collection URL
https://catalog.redhat.com/software/containers/
Package Name
rhbk/keycloak-rhel9-operator
CPEs
  • cpe:/a:redhat:build_keycloak:26.2::el9
Default Status
affected
Versions
Unaffected
  • From 26.2-12 before * (rpm)
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat build of Keycloak 26.2.11
Collection URL
https://access.redhat.com/downloads/content/package-browser/
CPEs
  • cpe:/a:redhat:build_keycloak:26.2::el9
Default Status
unaffected
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat build of Keycloak 26.4
Collection URL
https://catalog.redhat.com/software/containers/
Package Name
rhbk/keycloak-operator-bundle
CPEs
  • cpe:/a:redhat:build_keycloak:26.4::el9
Default Status
affected
Versions
Unaffected
  • From 26.4.4-1 before * (rpm)
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat build of Keycloak 26.4
Collection URL
https://catalog.redhat.com/software/containers/
Package Name
rhbk/keycloak-rhel9
CPEs
  • cpe:/a:redhat:build_keycloak:26.4::el9
Default Status
affected
Versions
Unaffected
  • From 26.4-3 before * (rpm)
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat build of Keycloak 26.4
Collection URL
https://catalog.redhat.com/software/containers/
Package Name
rhbk/keycloak-rhel9-operator
CPEs
  • cpe:/a:redhat:build_keycloak:26.4::el9
Default Status
affected
Versions
Unaffected
  • From 26.4-3 before * (rpm)
Vendor
Red Hat, Inc.Red Hat
Product
Red Hat build of Keycloak 26.4.4
Collection URL
https://access.redhat.com/downloads/content/package-browser/
Package Name
keycloak
CPEs
  • cpe:/a:redhat:build_keycloak:26.4::el9
Default Status
unaffected
Problem Types
TypeCWE IDDescription
CWECWE-384Session Fixation
Type: CWE
CWE ID: CWE-384
Description: Session Fixation
Metrics
VersionBase scoreBase severityVector
3.16.0MEDIUM
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
Version: 3.1
Base score: 6.0
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
Metrics Other Info
Red Hat severity rating
value:
Moderate
namespace:
https://access.redhat.com/security/updates/classification/
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Exploits
Credits
Red Hat would like to thank Simon Levermann (CTS EVENTIM Solutions GmbH) for reporting this issue.
Timeline
EventDate
Reported to Red Hat.2025-10-28 13:12:25
Made public.2025-10-28 00:00:00
Event: Reported to Red Hat.
Date: 2025-10-28 13:12:25
Event: Made public.
Date: 2025-10-28 00:00:00
Replaced By
Rejected Reason
References
HyperlinkResource
https://access.redhat.com/errata/RHSA-2025:21370
vendor-advisory
x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:21371
vendor-advisory
x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:22088
vendor-advisory
x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:22089
vendor-advisory
x_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2025-12390
vdb-entry
x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2406793
issue-tracking
x_refsource_REDHAT
https://github.com/keycloak/keycloak/issues/43853
N/A
Hyperlink: https://access.redhat.com/errata/RHSA-2025:21370
Resource:
vendor-advisory
x_refsource_REDHAT
Hyperlink: https://access.redhat.com/errata/RHSA-2025:21371
Resource:
vendor-advisory
x_refsource_REDHAT
Hyperlink: https://access.redhat.com/errata/RHSA-2025:22088
Resource:
vendor-advisory
x_refsource_REDHAT
Hyperlink: https://access.redhat.com/errata/RHSA-2025:22089
Resource:
vendor-advisory
x_refsource_REDHAT
Hyperlink: https://access.redhat.com/security/cve/CVE-2025-12390
Resource:
vdb-entry
x_refsource_REDHAT
Hyperlink: https://bugzilla.redhat.com/show_bug.cgi?id=2406793
Resource:
issue-tracking
x_refsource_REDHAT
Hyperlink: https://github.com/keycloak/keycloak/issues/43853
Resource: N/A
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found