CVE-2023-39955

    Dashboard / Vulnerabilities / CVE-2023-39955

    CVE-2023-39955

    Published: 10 Aug 2023Last Modified: 12 Aug 2026

    Summary: Notes attachment render HTML in preview mode

    Details: Notes is a note-taking app for Nextcloud, an open-source cloud platform. Starting in version 4.4.0 and prior to version 4.8.0, when creating a note file with HTML, the content is rendered in the preview instead of the file being offered to download. Nextcloud Notes app version 4.8.0 contains a patch for the issue. No known workarounds are available.

    References: https://hackerone.com/reports/1924355, https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/39xxx/CVE-2023-39955.json, https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6g88-37x7-4vw6, https://nvd.nist.gov/vuln/detail/CVE-2023-39955, https://github.com/nextcloud/notes/pull/1031

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- aa547d01617d5e0fb0a9a783714e3f9b9d73a430
    Fixed -50e881eb151ec5b94fa2bfe0b94c5cd3bbc2acc7

    Affected versions

    v4.8.0-beta.2
    v4.8.0-beta.1

    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-2023-39955 | CVE-DB