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CVE-2025-12390— Org.keycloak.protocol.oidc.endpoints.logoutendpoint: offline session takeover due to reused authentication session id

Quick assessment

Affected
Keycloak keycloak
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Red Hat build of Keycloak是美国红帽（Red Hat）公司的一款用于单点登录的Web应用。 Red Hat build of Keycloak存在授权问题漏洞，该漏洞源于会话标识符重用和注销时未正确清理，可能导致用户意外获取其他用户的会话令牌。

CVSS 6.0 · Medium EPSS 0.14% · P3

Affected Version Matrix 9

VendorProduct Version RangeStatus
Keycloak keycloak < 26.0.0 affected
Red Hat Red Hat build of Keycloak 26.2 26.2.11-1< * unaffected
26.2-12< * unaffected
26.2-12< * unaffected
Red Hat Red Hat build of Keycloak 26.2.11 any unaffected
Red Hat Red Hat build of Keycloak 26.4 26.4.4-1< * unaffected
26.4-3< * unaffected
26.4-3< * unaffected
Red Hat Red Hat build of Keycloak 26.4.4 any unaffected
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I. Basic Information for CVE-2025-12390

Vulnerability Information
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Vulnerability Title
Org.keycloak.protocol.oidc.endpoints.logoutendpoint: offline session takeover due to reused authentication session id
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
会话固定
Source: CVE Program / CVE List V5
Vulnerability Title
Red Hat build of Keycloak 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Red Hat build of Keycloak是美国红帽（Red Hat）公司的一款用于单点登录的Web应用。 Red Hat build of Keycloak存在授权问题漏洞，该漏洞源于会话标识符重用和注销时未正确清理，可能导致用户意外获取其他用户的会话令牌。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Keycloak keycloak 0 ~ 26.0.0 -
Red Hat Red Hat build of Keycloak 26.2 26.2.11-1 ~ * cpe:/a:redhat:build_keycloak:26.2::el9
Red Hat Red Hat build of Keycloak 26.2 26.2-12 ~ * cpe:/a:redhat:build_keycloak:26.2::el9
Red Hat Red Hat build of Keycloak 26.2 26.2-12 ~ * cpe:/a:redhat:build_keycloak:26.2::el9
Red Hat Red Hat build of Keycloak 26.2.11 - cpe:/a:redhat:build_keycloak:26.2::el9
Red Hat Red Hat build of Keycloak 26.4 26.4.4-1 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-3 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-3 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4.4 - cpe:/a:redhat:build_keycloak:26.4::el9

II. Public POCs for CVE-2025-12390

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III. Intelligence Information for CVE-2025-12390

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Vendor Advisories for CVE-2025-12390 (3)

Other References for CVE-2025-12390 (1)

IV. Related Vulnerabilities

Same product: keycloak
Same vendor: Keycloak
Same weakness: CWE-384

V. Comments for CVE-2025-12390

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