CVE-2026-85586: phpMyFAQ before 4.1.8 CAPTCHA Bypass via store parameter

Severity: medium (CVSS 6.9 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-04 · updated 2026-09-10
Weakness: CWE-799

Description

phpMyFAQ versions before 4.1.8 fail to validate CAPTCHA when the store parameter is set to 'now' in question submission requests. Unauthenticated attackers can bypass CAPTCHA protection and submit unlimited questions directly, causing database pollution and triggering outgoing mail notifications.

Affected products

thorsten phpMyFAQ: before 4.1.8 — fixed in 4.1.8

How to fix

Upgrade to a fixed version: thorsten phpMyFAQ 4.1.8. Check the vendor advisory for mitigations.

References

https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-72vj-pvm4-mm7x
https://www.vulncheck.com/advisories/phpmyfaq-before-4.1.8-captcha-bypass-via-store-parameter

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