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CVE-2026-34974

phpMyFAQ: SVG Sanitizer Bypass via HTML Entity Encoding leads to Stored XSS and Privilege Escalation

Published: Apr 2, 2026Updated: Apr 6, 2026 Sources: CVE List NVDCWE-79
NVD MITRE
5.4CVSSMEDIUM
EPSS Score
0.2%
Top 92.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

phpMyFAQ is an open source FAQ web application. Prior to version 4.1.1, the regex-based SVG sanitizer in phpMyFAQ (SvgSanitizer.php) can be bypassed using HTML entity encoding in javascript: URLs within SVG <a href> attributes. Any user with edit_faq permission can upload a malicious SVG that executes arbitrary JavaScript when viewed, enabling privilege escalation from editor to full admin takeover. This issue has been patched in version 4.1.1.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:RS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-79

Affected Products

phpMyFAQthorsten
On-premWeb App
Web & CMS Plugins
phpmyfaqphpmyfaqWeb & CMS Plugins
thorstenindividual-devWeb & CMS Pluginsaka thorsten/phpmyfaq, phpmyfaq
phpmyfaqoss-projectWeb & CMS Pluginsaka phpmyfaq, phpmyfaq

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-5crx-pfhq-4hgg
github.com
https://github.com/thorsten/phpMyFAQ/releases/tag/4.1.1
github.com

Timeline

Published
Apr 2, 2026
Last Updated
Apr 6, 2026

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