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users could create chat threads, self-deleted chat messages could be restored by their author after channel access was revoked, moderators reviewing a flagged chat message were shown the channel's current last_message (often unrelated DM content), and calendar event payloads exposed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.
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Affected Vendors & Products
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History
Mon, 15 Jun 2026 19:30:00 +0000
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ssvc
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Fri, 12 Jun 2026 23:00:00 +0000
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| First Time appeared |
Discourse
Discourse discourse |
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| Vendors & Products |
Discourse
Discourse discourse |
Fri, 12 Jun 2026 21:00:00 +0000
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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, 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users could create chat threads, self-deleted chat messages could be restored by their author after channel access was revoked, moderators reviewing a flagged chat message were shown the channel's current last_message (often unrelated DM content), and calendar event payloads exposed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. | |
| Title | Discourse: Chat misauthorization and information disclosure | |
| Weaknesses | CWE-200 CWE-862 |
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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-06-12T20:25:09.286Z
Updated: 2026-06-15T18:48:50.661Z
Reserved: 2026-05-08T18:45:10.097Z
Link: CVE-2026-45085
Updated: 2026-06-15T18:47:58.464Z
Status : Undergoing Analysis
Published: 2026-06-12T21:16:23.123
Modified: 2026-06-15T20:58:40.300
Link: CVE-2026-45085
No data.
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