Discourse: Chat misauthorization and information disclosure
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, four authorization/disclosure issues in the chat plugin (one also involving discourse-calendar): read-only category users could create chat threads, self-deleted chat messages could be restored by their author after channel access was revoked, moderators reviewing a flagged chat message were shown the channel's current last_message (often unrelated DM content), and calendar event payloads exposed the attached chat channel and its last message to viewers without chat access (including anonymous users). This affects sites with the chat plugin enabled; the calendar issue additionally requires discourse-calendar. This issue has been patched in versions 2026.1.4, 2026.3.1, 2026.4.1, and 2026.5.0-latest.1.
Problem Types
| Type | CWE ID | Description |
|---|
| CWE | CWE-862 | CWE-862: Missing Authorization |
| CWE | CWE-200 | CWE-200: Exposure of Sensitive Information to an Unauthorized Actor |
Type: CWE
Description: CWE-862: Missing Authorization
Type: CWE
Description: CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Metrics
| Version | Base score | Base severity | Vector |
|---|
| 3.1 | 5.3 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
Version: 3.1
Base score: 5.3
Base severity: MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N