CVE-2026-42030

6.1 mediumEPSS 0.2%

Medium (6.1) in osgeo mapserver. EPSS 0.2% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

6.1 medium

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.2% chance of exploitation in the next 30 days; higher than 16% of CVEs (scores of 2026-10-31)
CWE: CWE-80
Published: 2026-05-08
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

osgeo:mapserver

References

https://github.com/MapServer/MapServer/releases/tag/rel-8-6-2
https://github.com/MapServer/MapServer/security/advisories/GHSA-4g9f-ph64-hg2x
https://github.com/MapServer/MapServer/security/advisories/GHSA-4g9f-ph64-hg2x

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