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CVE PROGRAM SOURCE RECORD4.3 Medium

CVE-2026-72724

Discourse: Private Chat Threat Message Disclosure via Chat Onebox Channel/Threat ID Mismatch

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Status
Published
Published
Updated
Assigning organization
GitHub_M

Description

Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, plugins/chat/lib/chat/onebox_handler.rb resolves Chat::Thread by route thread_id independently of the route channel_id before checking whether the user can preview the selected chat channel. An authenticated user can pair a public channel ID with a private thread ID in a /onebox.json request and obtain private thread message content. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

discourse discourse

  • < 2026.1.6affected
  • >= 2026.5.0-latest, < 2026.5.2affected
  • >= 2026.6.0-latest, < 2026.6.1affected
  • >= 2026.7.0-latest, < 2026.7.0affected

References