CVE-2026-72727
Received Received - Intake

Stored XSS in Discourse Moderation Review Queue

Publication date: 2026-08-10

Last updated on: 2026-08-10

Assigner: GitHub, Inc.

Description
Discourse is an open-source discussion platform. Prior to 026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, a low-privileged user could place crafted content in the moderation review queue that executed stored cross-site scripting when a moderator viewed it on a site with a modified or disabled default Content Security Policy. 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-2026-72727
EUVD
EUVD-2026-55666

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
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.

Attack-Flow Graph

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Executive Summary

This vulnerability in Discourse allows a low-privileged user to submit crafted content that triggers stored cross-site scripting (XSS) when viewed by a moderator. The issue occurs on sites with modified or disabled default Content Security Policy (CSP).

Impact Analysis

An attacker could exploit this to execute malicious scripts in the moderator's browser, potentially stealing session cookies, performing actions on their behalf, or defacing the site. Moderators viewing the queue are the primary targets.

Mitigation Strategies

Update Discourse to versions 2026.1.6, 2026.5.2, 2026.6.1, or 2026.7.0 or later to fix the vulnerability.

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