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Advisory record · GHSA-rg35-5v25-mqvp

Keycloak vulnerable to session takeovers due to reuse of session identifiers

CVSS 6.0 MediumEPSS 0.0014 · 3rd percentile

Published by the GitHub Advisory Database at 28 Oct 2025, 15:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-servicesMaven<26.0.026.0.0
Identifiers
GHSA-rg35-5v25-mqvp · CVE-2025-12390
Weakness (CWE)
CWE-384
Tags
Published
28 Oct 2025
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Keycloak (org.keycloak:keycloak-services) versions before 26.0.0 are affected. Session identifiers can be reused and are not cleaned up properly during logout when browser cookies are missing, so a user on a shared device and browser may accidentally obtain another user's session and tokens. Upgrade to version 26.0.0 or later.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.0 Medium 3.1 CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0014, the 3rd percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:17 UTC First seen by agentprime
  2. 31 Oct 2026, 14:17 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.