CVE-2026-55876Public exploitNetwork attack vector

Script execution via unrestricted SVG attachment uploads

Published Oct 15, 2026 · Updated Oct 15, 2026

Unsafe attachment uploads in Helium Edu Helium Platform before 2.2.60 allow remote authenticated users to host executable SVG content. The attachment serializer relies on extension and MIME-type blocklists in conf/configs/common.py that omit SVG and HTML, permitting persistent browser-executable attachments. Visitors must open a public attachment URL to execute embedded script; separate-origin storage permits phishing content but prevents access to application cookies or storage in the maintained deployment.

CVSS severity3.5
Low
EPSS probability0.15%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe attachment uploads in Helium Edu Helium Platform before 2.2.60 allow remote authenticated users to host executable SVG content. The attachment serializer relies on extension and MIME-type blocklists in conf/configs/common.py that omit SVG and HTML, permitting persistent browser-executable attachments. Visitors must open a public attachment URL to execute embedded script; separate-origin storage permits phishing content but prevents access to application cookies or storage in the maintained deployment.

The record

CVE
CVE-2026-55876
Published
Oct 15, 2026
Updated
Oct 15, 2026
Vendor
Helium Edu
Product
Helium Platform
Classifications
CWE-79
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

3.5GitHub_MCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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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