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TI-2026-27196 Aliases CVE-2026-34974GHSA-5crx-pfhq-4hgg

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

Priority MEDIUM 58CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · 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. 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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00183 7th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed phpMyFAQ (thorsten): 4.1.1thorsten/phpmyfaq (Packagist): 4.1.1

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

VendorProductAffected versionsFixed inStatusSource
thorstenphpMyFAQbefore 4.1.14.1.1Patch availableCNA
—thorsten/phpmyfaq (Packagist)before 4.1.14.1.1Patch availableGHSA-5crx-pfhq-4hgg
  • phpMyFAQ Vendorthorsten Affected before 4.1.1 Fixed in 4.1.1 Patch available CNA
  • thorsten/phpmyfaq (Packagist) Vendor— Affected before 4.1.1 Fixed in 4.1.1 Patch available GHSA-5crx-pfhq-4hgg

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:phpmyfaq:phpmyfaq:*:*:*:*:*:*:*:*before 4.1.1Vulnerablethorsten
  • cpe:2.3:a:phpmyfaq:phpmyfaq:*:*:*:*:*:*:*:* Versions before 4.1.1 Vulnerable ·thorsten

Remediation

  • Fix · CNA phpMyFAQ (thorsten) Fixed in 4.1.1
  • Fix · GHSA-5crx-pfhq-4hgg thorsten/phpmyfaq (Packagist) Fixed in 4.1.1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-34974
  2. 2026-10-03 Alias added: GHSA-5crx-pfhq-4hgg

References

Exploit 1

Advisory 1

Other 2

  • TI-2023-00296 Improper Authentication in thorsten/phpmyfaq CVSS 3.1CRITICAL 9.8
  • TI-2026-53313 phpMyFAQ 3.1.0 through 4.1.6 Authentication Bypass via LDAP CVSS 4.0HIGH 8.8
  • TI-2025-37331 phpMyFAQ duplicate email registration allows multiple accounts with the same email CVSS 3.1CRITICAL 9.8
  • TI-2024-36257 phpMyFAQ Generates an Error Message Containing Sensitive Information if database server is not available CVSS 3.1HIGH 8.6
  • TI-2023-03720 Improper Neutralization of Formula Elements in a CSV File in thorsten/phpmyfaq CVSS 3.1CRITICAL 9.8
  • TI-2023-00749 Command Injection in thorsten/phpmyfaq CVSS 3.1CRITICAL 9.8
See all 153 →

Sources

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