CVE-2026-33423
Received Received - Intake
Privilege Escalation in Discourse via Group Notification Modification

Publication date: 2026-03-20

Last updated on: 2026-03-25

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, staff can modify any user's group notification level. 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
2026-03-20
Last Modified
2026-03-25
Generated
2026-06-16
AI Q&A
2026-03-21
EPSS Evaluated
2026-06-15
NVD
CVE-2026-33423
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-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.
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Executive Summary

This vulnerability affects the Discourse open-source discussion platform. Prior to certain fixed versions (2026.3.0-latest.1, 2026.2.1, and 2026.1.2), staff members had the ability to modify any user's group notification level without proper restrictions.

Impact Analysis

The vulnerability allows staff users to change notification settings for any user, which could lead to unwanted or unauthorized changes in how users receive notifications. This might disrupt user experience or communication 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 updating is the immediate recommended step.

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