CVE-2026-45085
MediumCVSS 5.3Exploitation Probability (EPSS)
Low risk9th percentile - higher than 9% of all known CVEs
Summary
Discourse is an open-source discussion platform that had four authorization/disclosure issues in the chat plugin. Read-only category users could create chat threads, and self-deleted messages could be restored by their authors after channel access was revoked.
Risk Assessment
These issues could lead to unauthorized access to information and breaches of user privacy, potentially impacting the organization's reputation and user trust.
Recommendation
It is recommended to update to versions 2026.1.4, 2026.3.1, 2026.4.1, or 2026.5.0-latest.1 to mitigate these vulnerabilities.
Original NVD description (English source)
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users could create chat threads, self-deleted chat messages could be restored by their author after channel access was revoked, moderators reviewing a flagged chat message were shown the channel's current last_message (often unrelated DM content), and calendar event payloads exposed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.