CVE-2026-46556
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk11th percentile - higher than 11% of all known CVEs
Summary
Server-Side Request Forgery (SSRF) vulnerability in FlaskBB, a forum software written in Python using Flask. Prior to version 2.2.1, the get_image_info() function allows any authenticated user to force the server to send HTTP requests to arbitrary internal endpoints, including cloud metadata services. This is a blind SSRF with confirmed internal port scanning and internal API triggering capabilities.
Risk Assessment
The risk is internal network exploration and access to sensitive services, potentially leading to data leakage or further attacks.
Recommendation
Upgrade FlaskBB to version 2.2.1 or later immediately and restrict access to image upload functionality.
Other vulnerabilities in FlaskBB
See all- CVE-2026-22660High
FlaskBB through version 2.2.0 contains a logic flaw vulnerability that allows authenticated administrators to delete all built-in authorization groups. The issue is a type mismatch in the bulk AJAX endpoint, where JSON integer group IDs are compared against string literals, causing the protection check to always pass.
- CVE-2026-22659High
FlaskBB through version 2.2.0 contains an authorization bypass vulnerability that allows authenticated moderators to perform unauthorized actions on topics in forums they do not control by submitting crafted topic ID lists. Attackers can include a low-ID topic from a permitted forum as an anchor in a batch request, causing the permission check applied only to the first result to pass, and then execute lock, unlock, delete, or hide actions against topics in unmoderated forums.
Original NVD description (English source)
FlaskBB is a Forum Software written in Python using the micro framework Flask. Prior to version 2.2.1, a Server-Side Request Forgery (SSRF) vulnerability in get_image_info() allows any authenticated user to force the server to send HTTP requests to arbitrary internal endpoints, including cloud metadata services. This is a blind SSRF with confirmed internal port scanning and internal API triggering capabilities. Version 2.2.1 patches the issue.