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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.

PUBLISHED Reserved 2026-05-18 | Published 2026-06-12 | Updated 2026-06-15 | Assigner GitHub_M




MEDIUM: 4.3CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Problem types

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

Product status

>= 2026.1.0-latest, < 2026.1.4
affected

>= 2026.3.0-latest, < 2026.3.1
affected

>= 2026.4.0-latest, < 2026.4.1
affected

References

github.com/...course/security/advisories/GHSA-wvrm-9v64-m96p

cve.org (CVE-2026-47263)

nvd.nist.gov (CVE-2026-47263)

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