CVE-2026-55876: HeliumEdu platform, XSS

Описание

Оригинално описание

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.

Засегнати продукти

• HeliumEdu platform: < 2.2.60

Вид слабост

• CWE-79 XSS

История

Други уязвимости в HeliumEdu platform

• 4.3CVE-2026-55875

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-55876
• https://nvd.nist.gov/vuln/detail/CVE-2026-55876
• https://github.com/HeliumEdu/platform/security/advisories/GHSA-7r65-76fw-ch5c
• https://github.com/HeliumEdu/platform/commit/f0de5c985c701942758b805a3d11dfb008a6af88