Description
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.
References (2)
Core 2
Core References
Exploit, Third Party Advisory x_refsource_confirm
https://github.com/discourse/discourse/security/advisories/GHSA-59jr-pj65-qmvr
Patch, Third Party Advisory x_refsource_misc
https://github.com/discourse/discourse/commit/7a8ec129fb54f188b2da6588c9d24d3a36eb0d39
Scores
CVSS v3
6.8
EPSS
0.0030
EPSS Percentile
53.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-20
Status
published
Products (2)
discourse/discourse
2.8.0 beta1 (9 CPE variants)
discourse/discourse
< 2.7.12
Published
Jan 04, 2022
Tracked Since
Feb 18, 2026