CVE-2024-45303: Discourse Calendar

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

Discourse Calendar plugin adds the ability to create a dynamic calendar in the first post of a topic to Discourse. Rendering event names can be susceptible to XSS attacks. This vulnerability only affects sites which have modified or disabled Discourse’s default Content Security Policy. The issue is patched in version 0.5 of the Discourse Calendar plugin.

Affected products

• Discourse Calendar: before 0.5 (fixed in 0.5)

Published 2024-09-12. Last modified 2026-06-17.