CVE-2026-85271 json
Open edX Platform: Stored CSS Injection in Email Digest Notifications via Unsanitized Thread Title (incomplete patch of CVE-2026-42857)
published 2026-09-18 51 d ago modified 2026-09-24 45 d ago also EUVD-2026-83443
- cvss
- 6.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 29%
- public exploits
- 0
- none known
Summary
Open 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.
Patch / fix
- github.com/openedx/openedx-platform@2af03d2 commit
- github.com/openedx/openedx-platform@52f2b3b commit
- github.com/openedx/openedx-platform@5eae6e5 commit
- github.com/openedx/openedx-platform/releases/tag/release/ulmo.4 release
- github.com/openedx/openedx-platform/releases/tag/release/verawood.1 release
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 47 d ago
Exploit prediction
0.35% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
Affected products
- openedx openedx-platform
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
- github.com /openedx/openedx-platform/commit/2af03d21b4142e53e375c7f3699b313e92ec5121
- github.com /openedx/openedx-platform/commit/52f2b3bb3e6fac2601c29e8f926c81498d20bb0b
- github.com /openedx/openedx-platform/commit/5eae6e51a8797cd3b87cc132f5de73d52561c4d7
- github.com /openedx/openedx-platform/security/advisories/GHSA-rv5w-f4r5-h77g
- github.com /openedx/openedx-platform/releases/tag/release/ulmo.4
- github.com /openedx/openedx-platform/releases/tag/release/verawood.1
Sources
- CVE List CVE-2026-85271
- NVD CVE-2026-85271
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.