CVE-2026-27935
Received Received - Intake
Information Disclosure in Discourse API Exposes Admin Metadata

Publication date: 2026-03-19

Last updated on: 2026-03-23

Assigner: GitHub, Inc.

Description
Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have a vulnerability in an API endpoint that discloses private topic metadata of admin users to moderator users even if the moderators do not have access to the private topics. 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
2026-03-23
Generated
2026-06-16
AI Q&A
2026-03-20
EPSS Evaluated
2026-06-15
NVD
CVE-2026-27935
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-201 The code transmits data to another actor, but a portion of the data includes sensitive information that should not be accessible to that actor.
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Executive Summary

This vulnerability exists in Discourse, an open-source discussion platform, in versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2. It involves an API endpoint that improperly discloses private topic metadata of admin users to moderator users. This disclosure happens even if the moderators do not have access rights to those private topics.

Impact Analysis

The vulnerability can lead to unauthorized disclosure of private topic metadata related to admin users to moderators who should not have access to that information. This could result in privacy breaches and potential misuse of sensitive administrative information within the platform.

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 and recommended step.

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