Critical severity · published Oct 17, 2026
CVE-2026-111911
phpMyFAQ 4.0.0 before 4.1.9 Authentication Bypass via WebAuthn Credential Injection
9.8
CVSS
0.5%
EPSS
No
On KEV
Description
phpMyFAQ 4.0.0 before 4.1.9 contains an authentication bypass vulnerability where WebAuthn registration endpoints attach credentials to any account without authentication or challenge validation. Attackers can stage a victim username, submit a forged fmt=none attestation to register a passkey, then log in bypassing passwords and TOTP for account takeover.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PH
phpMyFAQ · thorsten
4.0.0 before 4.1.9 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-111911
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-111911
github.com
https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-g6cq-6rqg-6c9p
github.com
https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-rg9h-f29v-xhxr
www.vulncheck.com
https://www.vulncheck.com/advisories/phpmyfaq-4.0.0-before-4.1.9-authentication-bypass-via-webauthn-credential-injection
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