CVE-2026-16889

    Dashboard / Vulnerabilities / CVE-2026-16889

    CVE-2026-16889

    Published: 29 Oct 2026Last Modified: 31 Oct 2026

    Summary:

    Details: In openEQUELLA before 2026.1, the pre-login notice image upload endpoint (PUT /api/preloginnotice/image/{name}) does not validate the type of uploaded files and serves them with a Content-Type derived from the supplied filename. A user holding the EDIT_SYSTEM_SETTINGS permission can upload an HTML file that is then served as text/html from the openEQUELLA origin, resulting in stored cross-site scripting. Unauthenticated exploitation is possible where EDIT_SYSTEM_SETTINGS has been granted to the guest user or everyone.

    References: https://openequella.github.io/guides/, https://github.com/openequella/openEQUELLA/security/advisories/GHSA-q2xv-rffq-mj5w

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -25e9002452cf7d18ec96500cdfdb433126e70cac

    Affected versions

    2025.2.0

    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-2026-16889 | CVE-DB