Reflected XSS Vulnerability in MapServer Affects Web-Based GIS Applications
CVE-2026-42030

6.1MEDIUM

Key Information:

Vendor

Mapserver

Status
Mapserver
Vendor
CVE Published:
8 May 2026

What is CVE-2026-42030?

MapServer, a robust platform for creating web-based Geographic Information Systems (GIS), is susceptible to a reflected Cross-Site Scripting (XSS) vulnerability. This flaw can be exploited by an unauthorized user who crafts a specific WMS URL that includes an unsanitized SRS parameter in WMS 1.3.0 requests. Once this malicious URL is accessed by any user, they can unknowingly execute arbitrary HTML or JavaScript within their browsers. This critical aspect of the vulnerability necessitates immediate attention, especially since it has been patched in version 8.6.2.

Affected Version(s)

MapServer >= 6.0, < 8.6.2

References

https://github.com/MapServer/MapServer/security/advisorie...
x_refsource_CONFIRM
https://github.com/MapServer/MapServer/releases/tag/rel-8...
x_refsource_MISC

CVSS V3.1

Score:
6.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.