CVE-2026-55875Public exploitNetwork attack vector

Internal service reconnaissance via unchecked calendar URL fetching

Published Oct 15, 2026 · Updated Oct 15, 2026

SSRF in Helium Edu Helium Platform before 2.2.60 allows remote authenticated users to probe internal services via calendar URLs. In helium/feed/services/icalexternalcalendarservice.py, validate_url checks URL syntax before passing attacker-selected destinations to urllib.request.urlopen, while fetch_ical_conditional periodically refetches stored URLs. Any valid account suffices, and distinct errors reveal internal port reachability; demonstrated impact excludes credential or secret retrieval.

CVSS severity4.3
Medium
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Helium Edu Helium Platform before 2.2.60 allows remote authenticated users to probe internal services via calendar URLs. In helium/feed/services/icalexternalcalendarservice.py, validate_url checks URL syntax before passing attacker-selected destinations to urllib.request.urlopen, while fetch_ical_conditional periodically refetches stored URLs. Any valid account suffices, and distinct errors reveal internal port reachability; demonstrated impact excludes credential or secret retrieval.

The record

CVE
CVE-2026-55875
Published
Oct 15, 2026
Updated
Oct 15, 2026
Vendor
Helium Edu
Product
Helium Platform
Classifications
CWE-918, T1046
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.2.60

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Helium Edu · Helium Platformversion=< 2.2.60

Published CVSS scores

4.3Helium EduCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1046Network Service Discovery

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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