GO-2026-4302

    Dashboard / Vulnerabilities / GO-2026-4302

    GO-2026-4302

    Published: 13 Jan 2026Last Modified: 3 Mar 2026

    Summary: Mattermost Server vulnerable to XSS via an uploaded file in github.com/mattermost/mattermost-server

    Details: Mattermost Server vulnerable to XSS via an uploaded file in github.com/mattermost/mattermost-server

    References: https://github.com/advisories/GHSA-8pff-p3gx-w4jf, https://nvd.nist.gov/vuln/detail/CVE-2017-18904, https://github.com/mattermost/mattermost/commit/6a2754376c8c8270be5e11e3fdab589659d0cc8d, https://github.com/mattermost/mattermost/commit/bde06a7bc3a03a56da224c1ffcd8bffb0af8071b, https://github.com/mattermost/mattermost/commit/f06c5bef4d78966c60b153bbec6eea4ec0be9e68, https://mattermost.com/security-updates

    Affected packages

    Package

    Name: github.com/mattermost/mattermost-server

    Purl: pkg:golang/github.com/mattermost/mattermost-server

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 0
    Fixed -3.9.2+incompatible

    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
    GO-2026-4302 | CVE-DB