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CVE-2026-55875— Helium: SSRF via External Calendar URL Allows Authenticated Users to Probe Internal Network

Quick assessment

Affected
HeliumEdu platform
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Helium 是一款免费的学生在线规划工具，可用于管理课程、作业、成绩和笔记。在版本 2.2.60 之前，任何经过身份验证的用户均可通过向 发送 POST 请求提交任意 URL。Helium 的 模块仅使用 函数检查 URL 的语法格式，随后将该值直接传递给 ；此外， 会定期重新获取已存储的 URL。 因此，服务器可向攻击者指定的外部或内部主机发起请求；不同的响应结果（包括针对非 HTTP 服务时未捕获的 异常）可揭示内部主机的可达性及端口信息。该漏洞的主要影响为强制发起出站请求以及用于内部服务探测；但由于相关的

CVSS 4.3 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
HeliumEdu platform < 2.2.60 affected
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I. Basic Information for CVE-2026-55875

Vulnerability Information
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Vulnerability Title
Helium: SSRF via External Calendar URL Allows Authenticated Users to Probe Internal Network
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
HeliumEdu platform < 2.2.60 -

II. Public POCs for CVE-2026-55875

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III. Intelligence Information for CVE-2026-55875

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Other References for CVE-2026-55875 (2)

IV. Related Vulnerabilities

Same product: platform
Same vendor: HeliumEdu
Same weakness: CWE-918

V. Comments for CVE-2026-55875

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