CVE-2023-43657: Discourse Discourse-Encrypt

Medium severity, CVSS 6.1. EPSS: 0.6% chance of exploitation in the next 30 days.

discourse-encrypt is a plugin that provides a secure communication channel through Discourse. Improper escaping of encrypted topic titles could lead to a cross site scripting (XSS) issue when a site has content security policy (CSP) headers disabled. Having CSP disabled is a non-default configuration, and having it disabled with discourse-encrypt installed will result in a warning in the Discourse admin dashboard. This has been fixed in commit `9c75810af9` which is included in the latest version of the discourse-encrypt plugin. Users are advised to upgrade. Users unable to upgrade should ensure that CSP headers are enabled and properly configured.

Affected products

• Discourse Discourse-Encrypt: before 2023-09-28 (fixed in 2023-09-28)

Published 2023-09-28. Last modified 2026-06-17.