CVE-2026-46364

published 2026-05-15

CVE-2026-46364: phpMyFAQ before 4.1.2 contains an unauthenticated SQL injection vulnerability in BuiltinCaptcha::garbageCollector() and BuiltinCaptcha::saveCaptcha() methods…

Priority P2 72 critical 9.8 CVSS 3.1

AV N AC L PR N UI N S U C H I H A H

EXPLOIT

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

1 ranges

Vendor	Product	Version range	Fixed in
thorsten	phpmyfaq	< 4.1.2	4.1.2

Detection & IOCs extracted from sources · hover to see the quote

url /api/captcha↗

sigma

detection:
  selection:
    User-Agent|contains: "8'"
    status_code: 200
    body|contains: 'Truncated incorrect DOUBLE'
  condition: and

• → Monitor HTTP requests to GET /api/captcha for User-Agent headers containing SQL injection payloads (e.g., single quotes, time-based blind SQLi patterns such as SLEEP() or boolean expressions). ↗
• → Alert on HTTP responses with status 200 that contain the MySQL error string 'Truncated incorrect DOUBLE' in the body, as this is a fingerprint of successful time-based blind SQL injection triggering against phpMyFAQ's captcha endpoint. ↗
• → The injection points are the BuiltinCaptcha::garbageCollector() and BuiltinCaptcha::saveCaptcha() methods, which interpolate the User-Agent header directly into DELETE and INSERT SQL queries — focus WAF/IDS rules on the User-Agent field for requests to the captcha API. ↗
• → The attack is unauthenticated; no session or credentials are required. Prioritize detection at the perimeter/WAF layer for all requests to /api/captcha regardless of authentication state. ↗
• → Sensitive data at risk includes user credentials, admin tokens, and SMTP credentials — monitor for anomalous data exfiltration patterns in responses from the captcha endpoint. ↗

• · Vulnerability affects phpMyFAQ versions before 4.1.2 only; instances already upgraded to 4.1.2 or later are not affected. ↗

CVSS provenance

nvd v3.1 9.8 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd v4.0 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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CWE-89