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CVE-2021-43850 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:6.8 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H

CNA: [email protected]CVSS-B:6.8 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URL	Source(s)	Tag(s)
https://github.com/discourse/discourse/commit/7a8ec129fb54f188b2da6588c9d24d3a36eb0d39	CVE	PatchThird Party Advisory
https://github.com/discourse/discourse/security/advisories/GHSA-59jr-pj65-qmvr	CVE	ExploitThird Party Advisory
https://github.com/discourse/discourse/commit/7a8ec129fb54f188b2da6588c9d24d3a36eb0d39	[email protected]	PatchThird Party Advisory
https://github.com/discourse/discourse/security/advisories/GHSA-59jr-pj65-qmvr	[email protected]	ExploitThird Party Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
NVD-CWE-noinfo	Insufficient Information to Classify Weakness	[email protected]
CWE-20	Improper Input Validation	[email protected]

Affected Products

Product	Versions
discourse discourse	< 2.7.12 2.8.0 beta1 2.8.0 beta2 2.8.0 beta3 2.8.0 beta4
CPE cpe:2.3:a:discourse:discourse:::::::: cpe:2.3:a:discourse:discourse:2.8.0:beta1:::::: cpe:2.3:a:discourse:discourse:2.8.0:beta2:::::: cpe:2.3:a:discourse:discourse:2.8.0:beta3:::::: cpe:2.3:a:discourse:discourse:2.8.0:beta4:::::: cpe:2.3:a:discourse:discourse:2.8.0:beta5:::::: cpe:2.3:a:discourse:discourse:2.8.0:beta6:::::: cpe:2.3:a:discourse:discourse:2.8.0:beta7:::::: cpe:2.3:a:discourse:discourse:2.8.0:beta8:::::: cpe:2.3:a:discourse:discourse:2.8.0:beta9:::::: Remediation No remediation found in references.

Product

Versions

discourse discourse

< 2.7.12

2.8.0 beta1

2.8.0 beta2

2.8.0 beta3

2.8.0 beta4

CPE

cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*
cpe:2.3:a:discourse:discourse:2.8.0:beta1:*:*:*:*:*:*
cpe:2.3:a:discourse:discourse:2.8.0:beta2:*:*:*:*:*:*
cpe:2.3:a:discourse:discourse:2.8.0:beta3:*:*:*:*:*:*
cpe:2.3:a:discourse:discourse:2.8.0:beta4:*:*:*:*:*:*
cpe:2.3:a:discourse:discourse:2.8.0:beta5:*:*:*:*:*:*
cpe:2.3:a:discourse:discourse:2.8.0:beta6:*:*:*:*:*:*
cpe:2.3:a:discourse:discourse:2.8.0:beta7:*:*:*:*:*:*
cpe:2.3:a:discourse:discourse:2.8.0:beta8:*:*:*:*:*:*
cpe:2.3:a:discourse:discourse:2.8.0:beta9:*:*:*:*:*:*

Remediation

No remediation found in references.

Change History

5 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Jan 14, 2022	Initial Analysis	[email protected]