Threat database

Helium is a free online student planner for classes, homework, grades, and notes. Prior to 2.2.60, any authenticated user can submit an arbitrary URL to POST /feed/externalcalendars/, where helium/feed/services/icalexternalcalendarservice.py uses validate_url to check only URL syntax before passing the value to urllib.request.urlopen, and fetch_ical_conditional periodically refetches the stored URL. The server can therefore issue requests to attacker-selected external or internal hosts, while distinct responses, including an uncaught http.client.RemoteDisconnected condition for non-HTTP services, reveal internal host and port reachability. The supported impact is forced outbound requests and internal service reconnaissance; the advisory does not demonstrate secret retrieval because the relevant ECS credentials path is task-specific and unpredictable. This issue is fixed in version 2.2.60.

A cross-site scripting (XSS) vulnerability exists in the HeliumEdu platform prior to version 2.2.60. Authenticated users can upload SVG and HTML attachments via the POST /planner/attachments/ endpoint because these formats are not blocked. Uploaded SVG files served as image/svg+xml can execute embedded scripts when accessed via their public URLs, enabling persistent attacker-controlled active content and phishing. The attachment storage is on a separate origin, preventing script access to application cookies or session data. This vulnerability is fixed in version 2.2.60.