CVE-2023-43658

dicourse-calendar is a plugin for the Discourse messaging platform which adds the ability to create a dynamic calendar in the first post of a topic. Improper escaping of event titles could lead to Cross-site Scripting (XSS) within the 'email preview' UI when a site has CSP disabled. Having CSP disabled is a non-default configuration, so the vast majority of sites are unaffected. This problem is resolved in the latest version of the discourse-calendar plugin. Users are advised to upgrade. Users unable to upgrade should ensure CSP is enabled on the forum.

• CWE-79

• https://developer.mozilla.org/en-US/docs/Web/HTTP/CSPThird Party Advisory
• https://github.com/discourse/discourse-calendar/commit/9788310906febb36822d6823d14f1059c39644dePatch
• https://github.com/discourse/discourse-calendar/security/advisories/GHSA-3fwj-f6ww-7hr6Vendor Advisory
• https://developer.mozilla.org/en-US/docs/Web/HTTP/CSPThird Party Advisory
• https://github.com/discourse/discourse-calendar/commit/9788310906febb36822d6823d14f1059c39644dePatch
• https://github.com/discourse/discourse-calendar/security/advisories/GHSA-3fwj-f6ww-7hr6Vendor Advisory

Published

Oct 16, 2023

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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