SB20230816280 - Server-Side Request Forgery (SSRF) in Flarum
Published: August 16, 2023 Updated: April 20, 2026
Security Bulletin ID
SB20230816280
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Server-Side Request Forgery (SSRF) (CVE-ID: CVE-2023-40033)
The vulnerability allows a remote user to disclose local file contents or conduct a blind server-side request forgery attack.
The vulnerability exists due to server-side request forgery in the avatar upload handling through the intervention/image package when processing an uploaded file whose contents are interpreted as a URL after MIME type spoofing. A remote user can upload a crafted file with a spoofed MIME type to disclose local file contents or conduct a blind server-side request forgery attack.
Remediation
Install update from vendor's website.