{"schema":"threatline.record/2","record":{"id":"CVE-2026-55875","aliases":["GHSA-2f83-94pv-v3f5"],"summary":"Helium: SSRF via External Calendar URL Allows Authenticated Users to Probe Internal Network","details":"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.","categories":["Unclassified"],"product":"platform","vendor":"HeliumEdu","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-55875","source_modified_at":"2026-10-15T17:48:20.682Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"platform","vendor":"HeliumEdu","versions":[{"version":"< 2.2.60","status":"affected"}],"defaultStatus":null}],"fixed_versions":[],"cvss":4.3,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.0021,"percentile":0.10698,"score_date":"2026-10-23"},"published_at":"2026-10-15T17:24:00.931Z","modified_at":"2026-10-15T17:48:20.682Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-55875","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-15T17:48:20.682Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-55875","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/HeliumEdu/platform/security/advisories/GHSA-2f83-94pv-v3f5","tags":["exploit"]},{"source":"CVE List","url":"https://github.com/HeliumEdu/platform/commit/f0de5c985c701942758b805a3d11dfb008a6af88","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"poc","automatable":"no","technical_impact":"partial","assessed_at":"2026-10-15T17:47:47.971513Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-15T17:48:20.682Z","content_hash":"f85354cd0d1fd65c1b4d4c19c45b69d0a72d6529056cfaa3ad627eb3501428b8"}}