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Advisory record · GHSA-g8vr-x4qh-25qg

Keycloak: Policy bypass during WebAuthn credential registration via client-side JavaScript manipulation

CVSS 4.3 MediumEPSS 0.0039 · 33rd percentile

Published by the GitHub Advisory Database at 19 May 2026, 09:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-servicesMaven<26.6.326.6.3
Identifiers
GHSA-g8vr-x4qh-25qg · CVE-2026-8830
Weakness (CWE)
CWE-603
Tags
Published
19 May 2026
Updated
26 Jun 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 26.6.3 are vulnerable. An authenticated user can bypass the realm's configured WebAuthn policies during credential registration by manipulating client-side JavaScript, because the server does not check that the new credential's parameters, such as public key algorithms, match those policies. This can allow creation of non-compliant authentication methods. Upgrade to version 26.6.3.

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
4.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0039, the 33rd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:20 UTC First seen by agentprime
  2. 31 Oct 2026, 14:20 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.