CVE-2021-37633: Discourse

Medium severity, CVSS 6.1. EPSS: 0.8% chance of exploitation in the next 30 days.

Discourse is an open source discussion platform. In versions prior to 2.7.8 rendering of d-popover tooltips can be susceptible to XSS attacks. This vulnerability only affects sites which have modified or disabled Discourse's default Content Security Policy. This issue is patched in the latest `stable` 2.7.8 version of Discourse. As a workaround users may ensure that the Content Security Policy is enabled, and has not been modified in a way which would make it more vulnerable to XSS attacks.

Affected products

• Discourse Discourse: before 2.7.8 (fixed in 2.7.8); version 2.8.0 only

Published 2021-08-09. Last modified 2026-06-17.