Open edX Platform: Stored CSS Injection in Email Digest Notifications via Unsanitized Thread Title (incomplete patch of CVE-2026-42857)

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-85271
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-18 21:18:44 UTC
Updated2026-09-24 21:25:27 UTC
DescriptionOpen edX Platform enables the authoring and delivery of online learning at any scale. From Redwood until Ulmo and Verawood.1, the add_additional_attributes_to_notifications function in openedx/core/djangoapps/notifications/email/utils.py assigns notification content without sanitizing discussion-title values produced by get_notification_content in openedx/core/djangoapps/notifications/base_notification.py. An enrolled student can place CSS-capable markup in the post_title value supplied by lms/djangoapps/discussion/rest_api/discussions_notifications.py. Digest and batched-email rendering then passes that value through openedx/core/djangoapps/notifications/templates/notifications/digest_content.html as safe HTML, allowing email-open tracking and content spoofing or phishing when another learner opens a CSS-rendering client. The immediate-email path is not affected because it strips title markup and renders a separately sanitized body. This issue is fixed in Ulmo and Verawood.1.

Risk And Classification

Primary CVSS: v3.1 6.1 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.003540000 probability, percentile 0.264950000 (date 2026-09-25)

Problem Types: CWE-79 | CWE-79 CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
3.1CNADECLARED6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Openedx Openedx-platform affected >= release/redwood.1, < release/ulmo.4 Not specified

References

ReferenceSourceLinkTags
github.com/openedx/openedx-platform/commit/5eae6e51a8797cd3b87cc132f5de7... [email protected] github.com
github.com/openedx/openedx-platform/commit/52f2b3bb3e6fac2601c29e8f926c8... [email protected] github.com
github.com/openedx/openedx-platform/releases/tag/release/ulmo.4 [email protected] github.com
github.com/openedx/openedx-platform/commit/2af03d21b4142e53e375c7f3699b3... [email protected] github.com
github.com/openedx/openedx-platform/security/advisories/GHSA-rv5w-f4r5-h77g [email protected] github.com
github.com/openedx/openedx-platform/releases/tag/release/verawood.1 [email protected] github.com
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