Vulnerability Database

308,926

Total vulnerabilities in the database

CVE-2021-43850

Discourse is an open source platform for community discussion. In affected versions admins users can trigger a Denial of Service attack via the /message-bus/_diagnostics path. The impact of this vulnerability is greater on multisite Discourse instances (where multiple forums are served from a single application server) where any admin user on any of the forums are able to visit the /message-bus/_diagnostics path. The problem has been patched. Please upgrade to 2.8.0.beta10 or 2.7.12. No workarounds for this issue exist.

  • Published: Jan 4, 2022
  • Updated: Nov 16, 2025
  • CVE: CVE-2021-43850
  • Severity: Medium
  • Exploit:

CVSS v3:

  • Severity: Medium
  • Score: 6.8
  • AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:H

CVSS v2:

  • Severity: Low
  • Score: 4
  • AV:N/AC:L/Au:S/C:N/I:N/A:P

CWEs:

Software From Fixed in
discourse / discourse 2.8.0-beta1 2.8.0-beta1.x
discourse / discourse 2.8.0-beta2 2.8.0-beta2.x
discourse / discourse 2.8.0-beta3 2.8.0-beta3.x
discourse / discourse 2.8.0-beta4 2.8.0-beta4.x
discourse / discourse 2.8.0-beta5 2.8.0-beta5.x
discourse / discourse 2.8.0-beta6 2.8.0-beta6.x
discourse / discourse 2.8.0-beta7 2.8.0-beta7.x
discourse / discourse 2.8.0-beta9 2.8.0-beta9.x
discourse / discourse 2.8.0-beta8 2.8.0-beta8.x
discourse / discourse - 2.7.12