Cross-site Scripting (XSS) Affecting mapserver package, versions <8.6.2-1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN14-MAPSERVER-16637904
- published11 May 2026
- disclosed8 May 2026
Introduced: 8 May 2026
CVE-2026-42030 (opens in a new tab)How to fix?
Upgrade Debian:14 mapserver to version 8.6.2-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream mapserver package and not the mapserver package as distributed by Debian.
See How to fix? for Debian:14 relevant fixed versions and status.
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.