Discourse MsgBus Exposes Webhook Events (<=2026.4.1)
CVE-2026-47263 Published on June 12, 2026
Discourse: Prevent webhook payload disclosure on event redelivery
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.
Vulnerability Analysis
CVE-2026-47263 can be exploited with network access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.
Weakness Type
What is an Information Disclosure Vulnerability?
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
CVE-2026-47263 has been classified to as an Information Disclosure vulnerability or weakness.
Products Associated with CVE-2026-47263
Want to know whenever a new CVE is published for Discourse? stack.watch will email you.
Affected Versions
discourse:- Version >= 2026.1.0-latest, < 2026.1.4 is affected.
- Version >= 2026.3.0-latest, < 2026.3.1 is affected.
- Version >= 2026.4.0-latest, < 2026.4.1 is affected.