mapserver: MapServer is a system for developing web-based GIS applications
CVE-2026-42030 is fixed in mapserver on 1 platform by DEBIAN-CVE-2026-42030 (version 8.6.2-1), released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| mapserver · Debian 14 | 8.6.2-1 | DEBIAN-CVE-2026-42030 | May 15, 2026 |
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