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Advisory record · GHSA-7g5x-9c4v-4w5r

Keycloak REST Services has a WebAuthn Attestation Statement Verification Bypass

CVSS 3.1 LowEPSS 0.0023 · 13th percentile

Published by the GitHub Advisory Database at 27 Feb 2026, 09:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-servicesMaven<26.4.426.4.4
Identifiers
GHSA-7g5x-9c4v-4w5r · BIT-keycloak-2025-12150 · CVE-2025-12150
Weakness (CWE)
CWE-347
Tags
Published
27 Feb 2026
Updated
26 Aug 2026

Machine-written summary

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

Keycloak REST Services (org.keycloak:keycloak-services) versions before 26.4.4 contain a WebAuthn registration flaw. An attacker who can submit a registration request can use an attestation object with fmt "none" to bypass the realm's required direct attestation policy and register untrusted or forged authenticators, weakening authentication integrity. Upgrade to version 26.4.4 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
3.1 Low 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0023, the 13th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:19 UTC First seen by agentprime
  2. 31 Oct 2026, 14:19 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.