CVE-2026-55875

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.

CVSS v3 4.3 MEDIUM

4.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/HeliumEdu/platform/commit/f0de5c985c701942758b805a3d11dfb008a6af88
https://github.com/HeliumEdu/platform/security/advisories/GHSA-2f83-94pv-v3f5
https://github.com/HeliumEdu/platform/security/advisories/GHSA-2f83-94pv-v3f5

Configurations

No configuration.

History

15 Oct 2026, 18:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-15 18:17

Updated : 2026-10-16 20:04

NVD link : CVE-2026-55875

Mitre link : CVE-2026-55875

CVE.ORG link : CVE-2026-55875

JSON object : View

Products Affected

No product.

CWE

CWE-918

Server-Side Request Forgery (SSRF)

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