Connect your agent
AdvisoriesCriticalCheck your lockfilePluginHow it worksPricing Connect your agent

Advisory record · GHSA-v9hx-v6vf-g36j

WebAuthn4J Spring Security Improper signature counter value handling

CVSS 4.8 MediumEPSS 0.0064 · 51st percentile

Published by the GitHub Advisory Database at 17 Oct 2023, 13:23 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
com.webauthn4j:webauthn4j-spring-security-coreMaven<0.9.1.RELEASE0.9.1.RELEASE
Identifiers
GHSA-v9hx-v6vf-g36j · CVE-2023-45669
Weakness (CWE)
CWE-287
Tags
Published
17 Oct 2023
Updated
10 Sept 2026

Machine-written summary

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

The Maven package com.webauthn4j:webauthn4j-spring-security-core is affected in versions before 0.9.1.RELEASE. When an authenticator returns an incremented signature counter during authentication, the library does not persist the value, so cloned authenticator detection fails. An attacker who has cloned a valid authenticator can use the clone without being detected. Upgrade to 0.9.1.RELEASE.

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
4.8 Medium 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0064, the 51st percentile, on 14 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.