CVE-2026-33408
Received Received - Intake
Information Disclosure in Discourse Allows Moderators Partial Post Edit Access

Publication date: 2026-03-19

Last updated on: 2026-03-24

Assigner: GitHub, Inc.

Description
Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, moderators were able to see the first 40 characters of post edits in PMs and private categories. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.
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Meta Information
Published
2026-03-19
Last Modified
2026-03-24
Generated
2026-06-16
AI Q&A
2026-03-20
EPSS Evaluated
2026-06-15
NVD
CVE-2026-33408
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
discourse discourse From 2026.1.0 (inc) to 2026.1.2 (exc)
discourse discourse From 2026.2.0 (inc) to 2026.2.1 (exc)
discourse discourse 2026.3.0
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.
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Executive Summary

This vulnerability in Discourse, an open-source discussion platform, allowed moderators to see the first 40 characters of post edits in private messages (PMs) and private categories before certain patched versions were released.

It was fixed in versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2.

Impact Analysis

The impact of this vulnerability is limited to a minor confidentiality issue where moderators could view a small portion (first 40 characters) of edited content in private messages and categories.

The CVSS base score of 2.2 indicates a low severity impact, with limited confidentiality impact and no impact on integrity or availability.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, you should upgrade your Discourse installation to one of the patched versions: 2026.3.0-latest.1, 2026.2.1, or 2026.1.2.

No known workarounds are available, so applying the patch by upgrading is the immediate recommended step.

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