EUVD-2026-29165CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
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3DescriptionNVD
Open edX Platform enables the authoring and delivery of online learning at any scale. The HTML sanitizer clean_thread_html_body() used for discussion notification emails fails to remove <style> tags from user-generated discussion post content. This content is rendered with Django's |safe template filter in email notification templates, allowing any enrolled student to inject arbitrary CSS into email notifications sent to other users. This enables email tracking (IP address disclosure), content spoofing, and phishing attacks. This vulnerability is fixed with commit cddc25cd791bb78f76833896e4778f668861df12.
AnalysisAI
Stored cross-site scripting (XSS) via CSS injection in Open edX Platform allows enrolled students to inject arbitrary CSS into discussion notification emails sent to other users by bypassing insufficient HTML sanitization in the clean_thread_html_body() function. The vulnerability affects all versions prior to the fix commit and enables email tracking through malicious stylesheets, content spoofing, and phishing attacks against recipients who view notification emails.
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