CVE-2026-55876

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

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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.

CVSS 3.5 · Baja · EPSS 0,2%

Publicación

2026-10-15T17:23:07.781Z

Actualización

2026-10-21T01:01:03.086Z

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