CVE-2026-39843 Plane has a Server-Side Request Forgery (SSRF) in Favicon Fetching

Plane is an an open-source project management tool. From 0.28.0 to before 1.3.0, the remediation of GHSA-jcc6-f9v6-f7jw is incomplete which could lead to the same full read Server-Side Request Forgery when a normal html page contains a link tag with an href that redirects to a private IP address ...

CVE-2026-39843

CVE-2026-39843 affects Plane prior to 1.3.0. The favicon fetch path is vulnerable because fetch_and_encode_favicon() uses a redirects-enabled request, allowing Server-Side Request Forgery when a page contains a link tag with an href redirecting to a private IP, supplied by an authenticated attack...