High severity · published Aug 19, 2026
CVE-2026-76214
phpMyFAQ before 4.1.7 WebAuthn Replay Attack via Challenge
7.4
CVSS
0.4%
EPSS
No
On KEV
Description
phpMyFAQ before 4.1.7 fails to persist the WebAuthn login challenge generated by prepareForLogin, because neither WebAuthn controller saves the mutated key objects back to the database. At login the anti-replay comparison is skipped by its own null guard, allowing an attacker who captures a successful WebAuthn assertion to replay it indefinitely and authenticate as the user without any interaction or hardware key.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 33% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PH
phpMyFAQ · thorsten
before 4.1.7 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-76214
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-76214
Mitigation
https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-f534-wv9g-wx2w
Third Party Advisory
https://www.vulncheck.com/advisories/phpmyfaq-before-webauthn-replay-attack-via-challenge
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