thorsten phpMyFAQ up to 4.1.1 /api/captcha saveCaptcha sql injection

Summaryinfo

A vulnerability marked as critical has been reported in thorsten phpMyFAQ up to 4.1.1. The affected element is the function BuiltinCaptcha::garbageCollector/BuiltinCaptcha::saveCaptcha of the file /api/captcha. This manipulation causes sql injection. The identification of this vulnerability is CVE-2026-46364. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in thorsten phpMyFAQ up to 4.1.1. Affected by this vulnerability is the function BuiltinCaptcha::garbageCollector/BuiltinCaptcha::saveCaptcha of the file /api/captcha. The manipulation with an unknown input leads to a sql injection vulnerability. The CWE definition for the vulnerability is CWE-89. The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was shared by aisafe-bot as GHSA-289f-fq7w-6q2w. The advisory is shared at github.com. This vulnerability is known as CVE-2026-46364 since 05/13/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1505 for this issue.

Upgrading to version 4.1.2 eliminates this vulnerability. Applying the patch b9f25109fddb38eee19987183798638d07943f92 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-30601). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Content Management System

Vendor

• thorsten

Name

• phpMyFAQ

Version

• 4.1.0
• 4.1.1

License

• open-source

Website

• Product: https://github.com/thorsten/phpMyFAQ/

CPE 2.3info

• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion