SB2026042066 - Path traversal in Flarum
Published: April 20, 2026
Security Bulletin ID
SB2026042066
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Path traversal (CVE-ID: N/A)
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to path traversal in the LESS parser when compiling LESS config variables from theme color settings. A remote privileged user can submit a specially crafted setting value to disclose sensitive information.
The contents of an imported resource are embedded into the compiled forum.css, which is publicly served.
Remediation
Install update from vendor's website.