CVE-2024-26145: Discourse Calendar

Medium severity, CVSS 4.3. EPSS: 0.4% chance of exploitation in the next 30 days.

Discourse Calendar adds the ability to create a dynamic calendar in the first post of a topic on Discourse. Uninvited users are able to gain access to private events by crafting a request to update their attendance. This problem is resolved in commit dfc4fa15f340189f177a1d1ab2cc94ffed3c1190. As a workaround, one may use post visibility to limit access.

Affected products

• Discourse Calendar: before 2024-02-21 (fixed in 2024-02-21)

Published 2024-02-21. Last modified 2026-06-17.