phpMyFAQ - Stored XSS via Utils::parseUrl() in Comment Rendering

published 2026-05-06 6 mo ago modified 2026-11-08 17 h ago also EUVD-2026-30578 , GHSA-9525-27vj-c8r8

cvss: 7.6; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 16%
public exploits: 0; none known

phpMyFAQ before 4.1.2 contains a stored cross-site scripting vulnerability in Utils::parseUrl() that allows authenticated users to inject JavaScript via malformed URLs in comments. Attackers can craft URLs with unescaped quotes to inject event handlers, stealing admin session cookies and achieving full application takeover when visitors view affected FAQ pages.

Patch / fix

fixed in 3

packagist thorsten/phpmyfaq 4.1.2
packagist phpmyfaq/phpmyfaq 4.1.2
thorsten phpmyfaq 4.1.2

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: partial
Assessed: 5 mo ago (2026-05-16)

Exploit prediction

0.25% chance of exploitation in the next 30 days, higher than 16% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-9525-27vj-c8r8 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.6	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
CNA	4.0	8.3	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N
GitHub	3.1	7.6	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
CNA	4.0	8.3	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:L/VA:N/SC:H/SI:L/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

Affected packages

ecosystem	package	affected	fixed in
packagist	thorsten/phpmyfaq	>=4.1.1, <4.1.2	4.1.2
packagist	phpmyfaq/phpmyfaq	>=4.1.1, <4.1.2	4.1.2

Affected products

thorsten phpmyfaq

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation
CWE-116 Improper Encoding or Escaping of Output

References

github.com /thorsten/phpMyFAQ/security/advisories/GHSA-9525-27vj-c8r8
vendor-advisory, exploit, web
vulncheck.com /advisories/phpmyfaq-stored-xss-via-utils-parseurl-in-comment-rendering
third-party-advisory, web
nvd.nist.gov /vuln/detail/CVE-2026-46367
advisory
github.com /thorsten/phpMyFAQ
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary