CVE-2026-27934
Received Received - Intake
Information Disclosure via User Action API in Discourse

Publication date: 2026-03-19

Last updated on: 2026-03-25

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 lack of visibility checks with a user action API endpoint that results in disclosure of the title and post excerpt to unauthorized users, leading to information disclosure. 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
2026-03-25
Generated
2026-06-16
AI Q&A
2026-03-20
EPSS Evaluated
2026-06-15
NVD
CVE-2026-27934
EUVD
EUVD-2026-13196
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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Impact Analysis

The vulnerability can lead to unauthorized disclosure of information, specifically the titles and excerpts of posts on the Discourse platform. This means that sensitive or private discussion content could be exposed to users who should not have access, potentially compromising confidentiality.

Compliance Impact

I don't know

Detection Guidance

I don't know

Executive Summary

This vulnerability affects Discourse, an open-source discussion platform. In versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, there is a lack of visibility checks in a user action API endpoint. This flaw allows unauthorized users to access the title and post excerpt of discussions, leading to unintended information disclosure.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade Discourse 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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