Improper input validation in Discourse
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
EPSS: 0.008 (53.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:H.
Affected products
- Discourse — versions >= 2.8.0.beta, < 2.8.0.beta10, 2.8.0, < 2.7.12
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Third Party Advisory)
- security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-43850?
- CVE-2021-43850 is a medium-severity vulnerability in Discourse, classified under Improper Input Validation. CVSS score: 6.8/10. Published 2022-01-04.
- How severe is CVE-2021-43850?
- Medium severity. CVSS v3 base score is 6.8 out of 10.