CVE-2026-34974
MEDIUMphpMyFAQ: SVG Sanitizer Bypass via HTML Entity Encoding leads to Stored XSS and Privilege Escalation
Title source: cnaDescription
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.
References (2)
Core 2
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-5crx-pfhq-4hgg
X_Refsource_Misc x_refsource_misc
https://github.com/thorsten/phpMyFAQ/releases/tag/4.1.1
Scores
CVSS v3
5.4
EPSS
0.0018
EPSS Percentile
7.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-79
Status
published
Products (3)
phpmyfaq/phpmyfaq
< 4.1.1
thorsten/phpmyfaq
0 - 4.1.1Packagist
thorsten/phpMyFAQ
< 4.1.1
Published
Apr 02, 2026
Tracked Since
Apr 02, 2026