Advisory record · GHSA-gq4g-fpc9-vjfq

Webauthn: SimpleFakeCredentialGenerator with an empty secret produces predictable fake credentials, weakening username enumeration protection

CVSS 4.0, no score published

Published by the GitHub Advisory Database at 7 Jul 2026, 23:39 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
web-auth/webauthn-lib	Packagist	>=4.9.0, <5.3.5	5.3.5

Identifiers: GHSA-gq4g-fpc9-vjfq · PKSA-zk1n-qbm6-d3rq
Weakness (CWE): CWE-204 · CWE-330
Tags: Weak cryptography or TLS
CWE-204
Published: 7 Jul 2026
Updated: 10 Sept 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

Score	Rating	CVSS	Vector	Source
Not published	None	4.0	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P	GitHub Advisory Database

CISA KEV Not listed.
EPSS No score.

Timeline

31 Oct 2026, 14:00 UTC First seen by agentprime
31 Oct 2026, 14:00 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.