CVE-2021-43850

    Dashboard / Vulnerabilities / CVE-2021-43850

    CVE-2021-43850

    Published: 4 Jan 2022Last Modified: 9 Jul 2026

    Summary:

    Details: 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: https://github.com/discourse/discourse/commit/7a8ec129fb54f188b2da6588c9d24d3a36eb0d39, https://github.com/discourse/discourse/security/advisories/GHSA-59jr-pj65-qmvr

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -81b398030ef4389a4a8192a287bc1b26203d58e0

    Affected versions

    2.8.0-beta1
    2.8.0-beta2
    2.8.0-beta3
    2.8.0-beta4
    2.8.0-beta5
    2.8.0-beta6
    2.8.0-beta7
    2.8.0-beta8
    2.8.0-beta9

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2021-43850 | CVE-DB