Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Osgeo | Mapserver | >= 6.0.0, < 8.6.2 |
Related Weaknesses (CWE)
References
- https://github.com/MapServer/MapServer/releases/tag/rel-8-6-2ProductRelease Notes
- https://github.com/MapServer/MapServer/security/advisories/GHSA-4g9f-ph64-hg2xExploitVendor Advisory
- https://github.com/MapServer/MapServer/security/advisories/GHSA-4g9f-ph64-hg2xExploitVendor Advisory
FAQ
What is CVE-2026-42030?
CVE-2026-42030 is a vulnerability with a CVSS score of 6.1 (MEDIUM). 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...
How severe is CVE-2026-42030?
CVE-2026-42030 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-42030?
Check the references section above for vendor advisories and patch information. Affected products include: Osgeo Mapserver.