CVE-2023-43658

Summary

CVE-2023-43658 is a Cross-site Scripting (XSS) vulnerability affecting the dicourse-calendar plugin for Discourse messaging platform. The issue arises due to improper escaping of event titles in the plugin, which can be exploited when the 'email preview' UI is accessed with Content Security Policy (CSP) disabled. Since having CSP disabled is not the default setting, most Discourse forums are not vulnerable. However, affected users are strongly advised to upgrade to the latest version of the discourse-calendar plugin to mitigate the risk. For those unable to upgrade, enabling CSP is recommended as a workaround.

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