CVE-2026-85271Public exploitNetwork attack vector

Email content spoofing via unescaped discussion titles

Published Sep 18, 2026 · Updated Sep 18, 2026

Stored CSS injection in Open edX Platform Redwood through Verawood.1 allows remote authenticated users to spoof digest email content. get_notification_content inserts raw post_title values into notification.content, which digest_content.html renders with the safe filter. An enrolled student must create a crafted discussion title, and the effect occurs only when another learner opens a digest or batched email in a CSS-rendering client.

CVSS severity6.1
Medium
EPSS probability0.35%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Get started

Summary

What happened

Stored CSS injection in Open edX Platform Redwood through Verawood.1 allows remote authenticated users to spoof digest email content. get_notification_content inserts raw post_title values into notification.content, which digest_content.html renders with the safe filter. An enrolled student must create a crafted discussion title, and the effect occurs only when another learner opens a digest or batched email in a CSS-rendering client.

The record

CVE
CVE-2026-85271
Published
Sep 18, 2026
Updated
Sep 18, 2026
Vendor
Open edX
Product
Open edX Platform
Classifications
CWE-79, T1566
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= release/redwood.1, < release/ulmo.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Open edX · Open edX Platformversion=>= release/redwood.1, < release/ulmo.4

Published CVSS scores

6.1Open edXCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1566Phishing

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Get started to see how Hinoki identifies affected software and validates exploitability in your environment.

Get started