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.

• CWE-20

• https://github.com/discourse/discourse/commit/7a8ec129fb54f188b2da6588c9d24d3a36eb0d39Patch, Third Party Advisory
• https://github.com/discourse/discourse/security/advisories/GHSA-59jr-pj65-qmvrExploit, Third Party Advisory
• https://github.com/discourse/discourse/commit/7a8ec129fb54f188b2da6588c9d24d3a36eb0d39Patch, Third Party Advisory
• https://github.com/discourse/discourse/security/advisories/GHSA-59jr-pj65-qmvrExploit, Third Party Advisory

Published

Jan 4, 2022

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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