Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Prior to 3.7.7, Joplin Server's GET /shares/:id?resource_id= route serves a resource with the attacker-controlled mime value and omits Content-Disposition when the resource title is empty. A low-privileged user can publish an empty-title image/svg+xml attachment whose script executes when a victim opens the public share. By default, user content shares the Joplin Server application origin, allowing the script to access same-origin data and, when the victim is authenticated, perform actions with the victim's session, including reading administrative data and anti-CSRF tokens. Installations that configure USER_CONTENT_BASE_URL to a separate origin still execute the script, but on that separate user-content origin rather than the application origin. This issue is fixed in version 3.7.7.

Ein Angreifer kann mehrere Schwachstellen in Joplin ausnutzen, um Benutzerkonten zu übernehmen, erweiterte Berechtigungen zu erlangen, Sicherheitsmaßnahmen zu umgehen, beliebigen Code auszuführen, Daten offenzulegen oder zu manipulieren oder Cross-Site-Scripting-Angriffe durchzuführen.