Discourse: Prevent webhook payload disclosure on event redelivery

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.

Scores

EPSS (exploitation in 30 days)

0.21% · top 89% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.3.

Weakness

• CWE-200: Exposure of Sensitive Information to an Unauthorized Actor (opens in a new tab)All about CWE-200 and its CVEs

Affected products

• discourse · discourse

  • affected >= 2026.1.0-latest, < 2026.1.4
  • affected >= 2026.3.0-latest, < 2026.3.1
  • affected >= 2026.4.0-latest, < 2026.4.1

References (1)

• https://github.com/discourse/discourse/security/advisories/GHSA-wvrm-9v64-m96p (opens in a new tab)x_refsource_CONFIRM

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-47263](https://trackcve.app/badge/CVE-2026-47263.svg)](https://trackcve.app/cve/CVE-2026-47263)

Record last updated 15 Jun 2026, 19:28 UTC.