XSS in Phpmyfaq
CVE-2026-34974
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (15.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 15.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Phpmyfaq
- Thorsten Phpmyfaq — versions < 4.1.1
Weakness classification (CWE)
References
- github.com/thorsten/phpMyFAQ/security/advisories/GHSA-5crx-pfhq-4hgg (Exploit, Vendor Advisory)
- github.com/thorsten/phpMyFAQ/releases/tag/4.1.1 (Product)
Frequently asked questions
- What is CVE-2026-34974?
- CVE-2026-34974 is a medium-severity vulnerability in Phpmyfaq, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-04-02.
- How severe is CVE-2026-34974?
- Medium severity. CVSS v3 base score is 5.4 out of 10.