Vulnerability Database

309,103

Total vulnerabilities in the database

CVE-2021-32764

Discourse is an open-source discussion platform. In Discourse versions 2.7.5 and prior, parsing and rendering of YouTube Oneboxes can be susceptible to XSS attacks. This vulnerability only affects sites which have modified or disabled Discourse's default Content Security Policy. The issue is patched in stable version 2.7.6, beta version 2.8.0.beta3, and tests-passed version 2.8.0.beta3. As a workaround, 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.

  • Published: Jul 15, 2021
  • Updated: Nov 16, 2025
  • CVE: CVE-2021-32764
  • Severity: High
  • Exploit:

CVSS v3:

  • Severity: High
  • Score: 8.1
  • AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS v2:

  • Severity: Low
  • Score: 3.5
  • AV:N/AC:M/Au:S/C:N/I:P/A:N

CWEs:

OWASP TOP 10:

Software From Fixed in
discourse / discourse - 2.7.5.x
discourse / discourse 2.8.0-beta1 2.8.0-beta1.x