CVE-2026-33251

Received Received - Intake

Authorization Bypass in Discourse Allows Unauthorized Solution Acceptance

Publication date: 2026-03-20

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, an authorization bypass vulnerability in hidden Solved topics may allow unauthorized users to accept or unaccept solutions. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, ensure only trusted users are part of the Site Setting for accept_all_solutions_allowed_groups.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-03-20

Last Modified

2026-03-24

Generated

2026-07-06

AI Q&A

2026-03-21

EPSS Evaluated

2026-07-05

NVD

CVE-2026-33251

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 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 is an authorization bypass issue related to hidden Solved topics, which may allow unauthorized users to accept or unaccept solutions.

Impact Analysis

The impact of this vulnerability is that unauthorized users could manipulate the status of solutions in hidden Solved topics by accepting or unaccepting them. This could lead to misinformation or confusion about which solutions are valid or accepted within the discussion platform.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, you should ensure that only trusted users are part of the Site Setting for accept_all_solutions_allowed_groups.

Additionally, apply the patch by upgrading Discourse to one of the fixed versions: 2026.3.0-latest.1, 2026.2.1, or 2026.1.2.

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