What’s Vulnerable › Vulnerabilities

CVE-2026-46364: phpMyFAQ - SQL Injection via User-Agent Header in BuiltinCaptcha

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-15 · updated 2026-10-26
• Weakness: CWE-89

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.

Affected products

• thorsten phpMyFAQ: before 4.1.2 — fixed in 4.1.2

How to fix

Upgrade to a fixed version: thorsten phpMyFAQ 4.1.2. Check the vendor advisory for mitigations.

References

• https://github.com/thorsten/phpMyFAQ/commit/b9f25109fddb38eee19987183798638d07943f92
• https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-289f-fq7w-6q2w
• https://www.vulncheck.com/advisories/phpmyfaq-sql-injection-via-user-agent-header-in-builtincaptcha

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