CVE-2026-72730
Received Received - Intake

Stored XSS in Discourse Rich Text Editor

Publication date: 2026-08-10

Last updated on: 2026-08-10

Assigner: GitHub, Inc.

Description
Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, the Rich Text Editor rendered a chat-transcript username as HTML, allowing stored cross-site scripting. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.

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Meta Information

Published
2026-08-10
Last Modified
2026-08-10
Generated
2026-08-10
AI Q&A
2026-08-10
EPSS Evaluated
N/A
NVD
CVE-2026-72730
EUVD
EUVD-2026-55670

Affected Vendors & Products

Showing 8 associated CPEs
Vendor Product Version / Range
discourse discourse to 2026.1.6 (inc)
discourse discourse to 2026.5.2 (inc)
discourse discourse to 2026.6.1 (inc)
discourse discourse to 2026.7.0 (inc)
discourse discourse to 2026.1.6 (exc)
discourse discourse to 2026.5.2 (exc)
discourse discourse to 2026.6.1 (exc)
discourse discourse to 2026.7.0 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This vulnerability in Discourse, a discussion platform, involves the Rich Text Editor rendering a chat-transcript username as HTML. This allowed stored cross-site scripting (XSS) attacks before versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.

Impact Analysis

An attacker could exploit this to inject malicious scripts into web pages viewed by other users. This could lead to unauthorized actions, data theft, or session hijacking on affected Discourse instances.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR's data protection principles or HIPAA's security requirements. Organizations using vulnerable Discourse versions may face compliance violations.

Mitigation Strategies

Update Discourse to a patched version (2026.1.6, 2026.5.2, 2026.6.1, or 2026.7.0 or later) to fix the stored cross-site scripting vulnerability in the Rich Text Editor.

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