CVE-2023-43658

Summary

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.

Affected Software

Weaknesses

• CWE-79: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

ADP Enrichment

CVE Program Container

Additional References

• https://github.com/discourse/discourse-calendar/security/advisories/GHSA-3fwj-f6ww-7hr6
• https://github.com/discourse/discourse-calendar/commit/9788310906febb36822d6823d14f1059c39644de
• https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

References

• https://github.com/discourse/discourse-calendar/security/advisories/GHSA-3fwj-f6ww-7hr6
• https://github.com/discourse/discourse-calendar/commit/9788310906febb36822d6823d14f1059c39644de
• https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP

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