{"schemaVersion":3,"id":"CVE-2026-42030","aliases":["UBUNTU-CVE-2026-42030","DEBIAN-CVE-2026-42030"],"status":"published","duplicateOf":null,"title":null,"description":"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. 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