CVE-2026-42030

Published: May 8, 2026Modified: Jun 17, 2026

6.1

Vector

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

Exploitability: 2.8 / Impact: 2.7

Source: security-advisories@github.com (Secondary)

Description

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.

Affected (1)

Products: Osgeo: Mapserver

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Osgeo Mapserver	From 6.0.0 to 8.6.2

Related CWEs

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

The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages.

References (3)

https://github.com/MapServer/MapServer/releases/tag/rel-8-6-2

Source: security-advisories@github.com

ProductRelease Notes

https://github.com/MapServer/MapServer/security/advisories/GHSA-4g9f-ph64-hg2x

Source: security-advisories@github.com

ExploitVendor Advisory

https://github.com/MapServer/MapServer/security/advisories/GHSA-4g9f-ph64-hg2x

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

ExploitVendor Advisory

Timeline

No history available yet.