CVE-2023-43658

    Dashboard / Vulnerabilities / CVE-2023-43658

    CVE-2023-43658

    Published: 16 Oct 2023Last Modified: 28 Oct 2026

    Summary: Improper escaping of user input in discourse-calendar

    Details: dicourse-calendar is a plugin for the Discourse messaging platform which adds the ability to create a dynamic calendar in the first post of a topic. Improper escaping of event titles could lead to Cross-site Scripting (XSS) within the 'email preview' UI when a site has CSP disabled. Having CSP disabled is a non-default configuration, so the vast majority of sites are unaffected. This problem is resolved in the latest version of the discourse-calendar plugin. Users are advised to upgrade. Users unable to upgrade should ensure CSP is enabled on the forum.

    References: https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP, https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/43xxx/CVE-2023-43658.json, https://github.com/discourse/discourse-calendar/security/advisories/GHSA-3fwj-f6ww-7hr6, https://nvd.nist.gov/vuln/detail/CVE-2023-43658, https://github.com/discourse/discourse-calendar/commit/9788310906febb36822d6823d14f1059c39644de

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -9788310906febb36822d6823d14f1059c39644de

    Affected versions

    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-2023-43658 | CVE-DB