CVE-2026-42030

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 v3 6.1 MEDIUM

6.1^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/MapServer/MapServer/releases/tag/rel-8-6-2	Product Release Notes
https://github.com/MapServer/MapServer/security/advisories/GHSA-4g9f-ph64-hg2x	Exploit Vendor Advisory
https://github.com/MapServer/MapServer/security/advisories/GHSA-4g9f-ph64-hg2x	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:osgeo:mapserver:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-05-08 17:16

Updated : 2026-06-17 10:47

NVD link : CVE-2026-42030

Mitre link : CVE-2026-42030

CVE.ORG link : CVE-2026-42030

JSON object : View

Products Affected

osgeo

mapserver

CWE

CWE-80

Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

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