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    CVE-2026-42030

    MapServer is a system for developing web-based GIS applications. From version 6.0 to before version 8.6.2, a reflected XSS vulnerability in MapServer's WMS server allows an unauthenticated attacker to inject arbitrary HTML/JavaScript into the browser of any user who opens a crafted WMS URL. The vulnerability is triggered via FORMAT=application/openlayers combined with an unsanitized SRS parameter in WMS 1.3.0 requests. This issue has been patched in version 8.6.2.

    Published:May 8, 2026
    Last Modified:May 14, 2026
    EPS:May 8, 2026
    EPSS Score:0.00026
    CVSS Score:6.1

    Affected Products

    Vendor
    Mapserver
    Product
    Mapserver
    Vendor
    Osgeo
    Product
    Mapserver

    Exploits

    https://github.com/MapServer/MapServer/security/advisories/GHSA-4g9f-ph64-hg2xhttps://github.com/MapServer/MapServer/security/advisories/GHSA-4g9f-ph64-hg2x

    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