TI-2026-40909 Aliases CVE-2026-56736 GHSA-pgwp-vc7q-cvj3

phpMyFAQ has Stored XSS in Admin FAQ Editor via HTML Entity Bypass in Frontend FAQ Submission

HIGH 69CWE-79Published 2026-09-24 · Updated 2026-09-24

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: High · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

phpMyFAQ is an open source FAQ web application. A stored cross-site scripting (XSS) vulnerability in versions prior to 4.2.0-alpha allows any unauthenticated user (or low-privileged registered user) to inject arbitrary JavaScript that executes in an administrator's browser when they review or edit a user-submitted FAQ entry. This leads to admin account takeover via session theft. The vulnerability exists because `html_entity_decode()` converts HTML entities into executable HTML after `strip_tags()` has already passed them through, and the admin template renders the content with Twig's `|raw` filter without any output sanitization. Version 4.2.0-alpha fixes the issue.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00244 15th percentileScored 2026-11-07

Fix Fixed phpMyFAQ (thorsten): 4.2.0-alphathorsten/phpmyfaq (Packagist): 4.2.0-alpha+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
thorsten	phpMyFAQ	before 4.2.0-alpha	4.2.0-alpha	Patch available	CNA
—	thorsten/phpmyfaq (Packagist)	before 4.2.0-alpha	4.2.0-alpha	Patch available	GHSA-pgwp-vc7q-cvj3
—	phpmyfaq/phpmyfaq (Packagist)	before 4.2.0-alpha	4.2.0-alpha	Patch available	GHSA-pgwp-vc7q-cvj3

phpMyFAQ Vendorthorsten Affected before 4.2.0-alpha Fixed in 4.2.0-alpha Patch available CNA
thorsten/phpmyfaq (Packagist) Vendor— Affected before 4.2.0-alpha Fixed in 4.2.0-alpha Patch available GHSA-pgwp-vc7q-cvj3
phpmyfaq/phpmyfaq (Packagist) Vendor— Affected before 4.2.0-alpha Fixed in 4.2.0-alpha Patch available GHSA-pgwp-vc7q-cvj3

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:phpmyfaq:phpmyfaq::::::::	—	—	thorsten

cpe:2.3:a:phpmyfaq:phpmyfaq:*:*:*:*:*:*:*:* Versions — — ·thorsten

Remediation

Fix · CNA phpMyFAQ (thorsten) Fixed in 4.2.0-alpha
Fix · GHSA-pgwp-vc7q-cvj3 thorsten/phpmyfaq (Packagist) Fixed in 4.2.0-alpha Advisory →
Fix · GHSA-pgwp-vc7q-cvj3 phpmyfaq/phpmyfaq (Packagist) Fixed in 4.2.0-alpha Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-56736
2026-10-03 Alias added: GHSA-pgwp-vc7q-cvj3

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-56736

Other 4

TI-2023-00296 Improper Authentication in thorsten/phpmyfaq CVSS 3.1CRITICAL 9.8
TI-2026-76118 Authentication bypass in phpMyFAQ via WebAuthn credential injection CVSS 4.0CRITICAL 9.3
TI-2026-32868 phpMyFAQ - Unauthenticated Two-Factor Authentication Brute-Force via /admin/check Endpoint CVSS 4.0CRITICAL 9.3
TI-2026-76108 Unauthenticated denial of service in phpMyFAQ API pagination CVSS 4.0HIGH 8.7
TI-2026-53313 phpMyFAQ 3.1.0 through 4.1.6 Authentication Bypass via LDAP CVSS 4.0HIGH 8.8
TI-2026-34083 phpMyFAQ - Unauthenticated Information Disclosure via getIdFromSolutionId Permission Bypass CVSS 4.0HIGH 8.7

See all 224 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences