HeliumEdu Helium up to 2.2.59 External Calendar Service icalexternalcalendarservice.py validate_url server-side request forgery

Summaryinfo

A vulnerability marked as problematic has been reported in HeliumEdu Helium up to 2.2.59. Affected by this vulnerability is the function validate_url of the file helium/feed/services/icalexternalcalendarservice.py of the component External Calendar Service. This manipulation causes server-side request forgery. The identification of this vulnerability is CVE-2026-55875. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in HeliumEdu Helium up to 2.2.59. It has been declared as problematic. Affected by this vulnerability is the function validate_url of the file helium/feed/services/icalexternalcalendarservice.py of the component External Calendar Service. The manipulation with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. As an impact it is known to affect confidentiality. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-55875 since 06/17/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 2.2.60 eliminates this vulnerability.

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Productinfo

Vendor

• HeliumEdu

Name

• Helium

Version

• 2.2.0
• 2.2.1
• 2.2.2
• 2.2.3
• 2.2.4
• 2.2.5
• 2.2.6
• 2.2.7
• 2.2.8
• 2.2.9
• 2.2.10
• 2.2.11
• 2.2.12
• 2.2.13
• 2.2.14
• 2.2.15
• 2.2.16
• 2.2.17
• 2.2.18
• 2.2.19
• 2.2.20
• 2.2.21
• 2.2.22
• 2.2.23
• 2.2.24
• 2.2.25
• 2.2.26
• 2.2.27
• 2.2.28
• 2.2.29
• 2.2.30
• 2.2.31
• 2.2.32
• 2.2.33
• 2.2.34
• 2.2.35
• 2.2.36
• 2.2.37
• 2.2.38
• 2.2.39
• 2.2.40
• 2.2.41
• 2.2.42
• 2.2.43
• 2.2.44
• 2.2.45
• 2.2.46
• 2.2.47
• 2.2.48
• 2.2.49
• 2.2.50
• 2.2.51
• 2.2.52
• 2.2.53
• 2.2.54
• 2.2.55
• 2.2.56
• 2.2.57
• 2.2.58
• 2.2.59

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