CVE-2026-27936
Received Received - Intake
Restriction Bypass in Discourse Exposes Post Action Counts

Publication date: 2026-03-19

Last updated on: 2026-03-23

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, a restriction bypass allows restricted post action counts to be disclosed to non-privileged users through a carefully crafted request. 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-2026-27936
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-863 The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.
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Executive Summary

This vulnerability affects the Discourse open-source discussion platform. Before certain fixed versions, it allowed non-privileged users to bypass restrictions and view restricted post action counts by sending a specially crafted request.

Impact Analysis

The impact of this vulnerability is that unauthorized users can access information about restricted post action counts, which could lead to information disclosure and potentially aid in further attacks or misuse of 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 recommended action.

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