Critical severity · published May 15, 2026
CVE-2026-46364
phpMyFAQ - SQL Injection via User-Agent Header in BuiltinCaptcha
9.8
CVSS
1.7%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.7% · higher than 77% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PH
phpmyfaq · thorsten
before 4.1.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-46364
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-46364
github.com
https://github.com/thorsten/phpMyFAQ/commit/b9f25109fddb38eee19987183798638d07943f92
github.com
https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-289f-fq7w-6q2w
www.vulncheck.com
https://www.vulncheck.com/advisories/phpmyfaq-sql-injection-via-user-agent-header-in-builtincaptcha
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