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Back to active CVEs
Low · CVSS 3.5CVE-2026-55876

Helium: Stored XSS via Unrestricted SVG File Upload — Authenticated Users Can Store Executable ScriptsCVE-2026-55876

Answer in brief

CVE-2026-55876 records a Low severity (CVSS 3.5) vulnerability in Helium: Stored XSS via Unrestricted SVG File Upload — Authenticated Users Can Store Executable Scripts. The current sources do not mark it as known exploited. The current feed maps HeliumEdu/platform (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 15, 2026Updated Oct 15, 2026Source checked Oct 15, 2026First seen by HOL Oct 15, 2026Material review Oct 15, 2026
Upstream Advisory

Key facts

Risk
Low · CVSS 3.5
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 3.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps HeliumEdu/platform (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
HeliumEdu/platformgeneric<2.2.602.2.60

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for HeliumEdu/platform.
  2. 2Review the reported fix. Update HeliumEdu/platform to 2.2.60 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 15, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 15, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 15, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

Helium is a free online student planner for classes, homework, grades, and notes. Prior to 2.2.60, the POST /planner/attachments/ endpoint allows authenticated users to upload SVG and HTML attachments because conf/configs/common.py omits those formats from BLOCKED_ATTACHMENT_EXTENSIONS and BLOCKED_ATTACHMENT_MIME_TYPES, and helium/planner/serializers/attachmentserializer.py relies on those blocklists. An uploaded SVG served as image/svg+xml can execute embedded script when a visitor opens its public attachment URL, allowing persistent attacker-controlled active content and phishing under an application-managed storage URL. The attachment storage uses a separate origin from the application, so same-origin policy prevents the script from reading application cookies or storage, and application-session compromise is not supported by the maintained deployment configuration. This issue is fixed in version 2.2.60.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • HtmlUnit: Mutation XSS (mXSS) in HTMLWriterFilter - TEXTAREA/TITLE entity decode without re-encodeAlso CWE-79
  • WordPress YITH WooCommerce Compare plugin <= 3.15.0 - Cross Site Scripting (XSS) vulnerabilityAlso CWE-79
  • WordPress MDTF plugin <= 1.4.0 - Cross Site Scripting (XSS) vulnerabilityAlso CWE-79
  • WordPress Presto Player plugin <= 4.5.3 - Cross Site Scripting (XSS) vulnerabilityAlso CWE-79
  • WordPress Download Monitor plugin <= 5.3.3 - Cross Site Scripting (XSS) vulnerabilityAlso CWE-79
  • WordPress JetSmartFilters plugin <= 3.8.6 - Cross Site Scripting (XSS) vulnerabilityAlso CWE-79

Record context

Vulnerability class
XSS
EPSS
Not reported
CWE IDs
CWE-79
Source
CVE List V5
Source checked
Oct 15, 2026
References
2 linked sources
Open source record