---
id: CVE-2026-46364
title: phpMyFAQ - SQL Injection via User-Agent Header in BuiltinCaptcha
summary: >-
  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.…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-89
vendor: thorsten
product: phpmyfaq
affected:
  - phpmyfaq < 4.1.2
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-05-15T22:11:13.813389Z'
exploitAvailable: true
published: '2026-05-15'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T14:03:56.193Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-46364'
references:
  - url: >-
      https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-289f-fq7w-6q2w
    label: GitHub Security Advisory (GHSA-289f-fq7w-6q2w)
  - url: >-
      https://github.com/thorsten/phpMyFAQ/commit/b9f25109fddb38eee19987183798638d07943f92
    label: >-
      https://github.com/thorsten/phpMyFAQ/commit/b9f25109fddb38eee19987183798638d07943f92
  - url: >-
      https://www.vulncheck.com/advisories/phpmyfaq-sql-injection-via-user-agent-header-in-builtincaptcha
    label: >-
      VulnCheck Advisory: phpMyFAQ - SQL Injection via User-Agent Header in
      BuiltinCaptcha
tags:
  - cve.org
  - exploit-available
epss: 0.01709
epssPercentile: 0.77482
exploits:
  nuclei:
    - CVE-2026-46364
  checkedAt: '2026-11-08T14:51:57.343Z'
ingestedAt: '2026-11-08T14:51:22.418Z'
---

## Overview

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.

## Affected

- `phpmyfaq < 4.1.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.