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Advisory record · GHSA-9g98-5mj6-f9mv

Keycloak vulnerable to user impersonation via stolen UUID code

CVSS 8.7 HighEPSS 0.013 · 70th percentile

Published by the GitHub Advisory Database at 2 Mar 2023, 23:25 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-servicesMaven<21.0.121.0.1
Identifiers
GHSA-9g98-5mj6-f9mv · CVE-2023-0264
Weakness (CWE)
CWE-287 · CWE-345
Tags
Published
2 Mar 2023
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, Maven) versions before 21.0.1 are affected. An authenticated attacker who can obtain a specific piece of information from a request made by a user in the same realm can use it to impersonate that victim and generate new session tokens. The source gives few details about how that information is obtained. Upgrade to version 21.0.1 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
8.7 High 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.013, the 70th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:18 UTC First seen by agentprime
  2. 31 Oct 2026, 14:18 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.