CVE-2026-47263
Received Received - Intake
Information Disclosure in Discourse via Webhook Events

Publication date: 2026-06-12

Last updated on: 2026-06-12

Assigner: GitHub, Inc.

Description
Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, the MessageBus.publish call for /web_hook_events/<id> in Jobs::RedeliverWebHookEvents did not pass group_ids, leaving the channel readable by any authenticated user (or anonymous user on instances where login_required is disabled). Webhook IDs are sequential integers and trivially enumerable. This issue has been patched in versions 2026.1.4, 2026.3.1, 2026.4.1, and 2026.5.0-latest.1.
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Meta Information
Published
2026-06-12
Last Modified
2026-06-12
Generated
2026-06-13
AI Q&A
2026-06-13
EPSS Evaluated
N/A
NVD
CVE-2026-47263
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
discourse discourse From 2026.1.0 (inc) to 2026.1.4 (exc)
discourse discourse From 2026.3.0 (inc) to 2026.3.1 (exc)
discourse discourse From 2026.4.0 (inc) to 2026.4.1 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-200 The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
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Executive Summary

This vulnerability affects the Discourse open-source discussion platform in certain versions before 2026.1.4, 2026.3.1, and 2026.4.1. The issue lies in the MessageBus.publish call for /web_hook_events/<id> within the Jobs::RedeliverWebHookEvents component. Specifically, the call did not include group_ids, which means the channel was accessible to any authenticated user or even anonymous users if the instance had login requirements disabled. Since webhook IDs are sequential and easy to enumerate, unauthorized users could read webhook event channels they should not have access to.

Impact Analysis

The vulnerability allows unauthorized users to read webhook event channels that should be restricted. This could lead to information disclosure where sensitive webhook event data is exposed to users who are not supposed to see it. On instances where login is not required, even anonymous users could access this data, increasing the risk of data leakage.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade your Discourse installation to one of the patched versions: 2026.1.4, 2026.3.1, 2026.4.1, or 2026.5.0-latest.1.

These updates fix the issue where the MessageBus.publish call for /web_hook_events/<id> did not properly restrict access, preventing unauthorized users from reading webhook events.

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