High severity8.0NVD Advisory· Published Oct 16, 2023· Updated Jun 17, 2026

CVE-2023-43658

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Discourse (software)/Discourse Calendar3 versions
cpe:2.3:a:discourse:discourse_calendar:*:*:*:*:*:discourse:*:*+ 2 more
- cpe:2.3:a:discourse:discourse_calendar:*:*:*:*:*:discourse:*:*range: <=2023-10-16
- (no CPE)
- (no CPE)range: < 97883109

Patches

Vulnerability mechanics

References

github.com/discourse/discourse-calendar/commit/9788310906febb36822d6823d14f1059c39644denvdPatch
developer.mozilla.org/en-US/docs/Web/HTTP/CSPnvdThird Party Advisory
github.com/discourse/discourse-calendar/security/advisories/GHSA-3fwj-f6ww-7hr6nvdVendor Advisory

News mentions

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