CVE-2026-72729
Received Received - Intake

Stored XSS in Discourse via discourse-local-dates Plugin

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 discourse-local-dates plugin rendered crafted local-date format data as HTML on sites 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-2026-72729
EUVD
EUVD-2026-55669

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
discourse discourse-local-dates 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

Discourse is an open-source discussion platform. The vulnerability exists in the discourse-local-dates plugin before versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0. It allows crafted local-date format data to be rendered as HTML on sites where the default Content Security Policy is modified or disabled.

Detection Guidance

This vulnerability can be detected by checking the installed version of the discourse-local-dates plugin against the fixed versions (2026.1.6, 2026.5.2, 2026.6.1, or 2026.7.0). Use commands like 'bundle exec gem list discourse-local-dates' or check the Discourse admin panel for plugin versions.

Impact Analysis

This vulnerability could allow an attacker to inject malicious HTML content through crafted local-date format data. This may lead to cross-site scripting (XSS) attacks, potentially stealing user sessions, defacing the site, or spreading malware.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR's integrity and confidentiality principles. For HIPAA, it may risk exposing protected health information if exploited.

Mitigation Strategies

Immediately update Discourse to a fixed version (2026.1.6, 2026.5.2, 2026.6.1, or 2026.7.0). If updating is not possible, disable the discourse-local-dates plugin or ensure the Content Security Policy is properly configured to prevent HTML rendering of crafted local-date data.

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