Medium severity6.1NVD Advisory· Published May 8, 2026· Updated May 14, 2026
CVE-2026-42030
CVE-2026-42030
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. This issue has been patched in version 8.6.2.
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Affected products
3Patches
Vulnerability mechanics
References
2- github.com/MapServer/MapServer/security/advisories/GHSA-4g9f-ph64-hg2xnvdExploitVendor Advisory
- github.com/MapServer/MapServer/releases/tag/rel-8-6-2nvdProductRelease Notes
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