Is CVE-2026-72724 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-72724?

CVE-2026-72724 has a CVSS v3 severity of MEDIUM (4.3).

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CVE-2026-72724

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.