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.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-03-19

Last Modified

2026-03-23

Generated

2026-07-06

AI Q&A

2026-03-20

EPSS Evaluated

2026-07-05

NVD

CVE-2026-27936

Affected Vendors & Products

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

KEV

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.

Attack-Flow Graph

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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