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Advisory details: vulnrichment / CVE-2025-12390
Advisory ID vulnrichment/CVE-2025-12390
Aliases
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 0.0
Risk
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (1)
CWE-384 Session Fixation
System Score Found at
cvssv3.1 6
ssvc Track
Reference id Reference type URL
https://bugzilla.redhat.com/show_bug.cgi?id=2406793
https://github.com/keycloak/keycloak/issues/43853
cpe:/a:redhat:build_keycloak:26.2::el9 Other https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:build_keycloak:26.2::el9
cpe:/a:redhat:build_keycloak:26.4::el9 Other https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:build_keycloak:26.4::el9
CVE-2025-12390 https://access.redhat.com/security/cve/CVE-2025-12390
RHSA-2025:21370 Advisory https://access.redhat.com/errata/RHSA-2025:21370
RHSA-2025:21371 Advisory https://access.redhat.com/errata/RHSA-2025:21371
RHSA-2025:22088 Advisory https://access.redhat.com/errata/RHSA-2025:22088
RHSA-2025:22089 Advisory https://access.redhat.com/errata/RHSA-2025:22089
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N Found at None
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2025-10-28T13:45:05Z/ Found at None

Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2025-10-28T13:45:05Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2025/12xxx/CVE-2025-12390.json

Source Advisory: vulnrichment/CVE-2025-12390

View SSVC decision tree 
[{'Exploitation': 'none'},
 {'Automatable': 'no'},
 {'Technical Impact': 'total'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]