CVE-2026-46364

phpMyFAQ - SQL Injection via User-Agent Header in BuiltinCaptcha

State: Published
Severity: 9.3 Critical
Published: May 15, 2026
Updated: May 28, 2026
Reserved: May 13, 2026

Description

phpMyFAQ before 4.1.2 contains an unauthenticated SQL injection vulnerability in BuiltinCaptcha::garbageCollector() and BuiltinCaptcha::saveCaptcha() methods that interpolate unsanitized User-Agent headers into DELETE and INSERT queries. Unauthenticated attackers can exploit the public GET /api/captcha endpoint by crafting malicious User-Agent headers to perform time-based blind SQL injection, extracting sensitive data including user credentials, admin tokens, and SMTP credentials from the database.

Scores

CVSS	Score	Vector	Source
4.0	9.3 Critical	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	VulnCheck
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	VulnCheck

Weaknesses

CWE-89 Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')

Affected Products

Product	Versions
phpmyfaqthorsten	before 4.1.2Affected 4.1.2Not affected

References

GHSA Advisory GHSA-289f-fq7w-6q2wvendor-advisory
https://github.com/thorsten/phpMyFAQ/commit/b9f25109fddb38eee19987183798638d07943f92patch
VulnCheck Advisory: phpMyFAQ - SQL Injection via User-Agent Header in BuiltinCaptchathird-party-advisory

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