CVE-2026-42030

6.1 MEDIUM
Published: May 08, 2026 Modified: May 14, 2026
View on NVD

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://github.com/MapServer/MapServer/releases/tag/rel-8-6-2
Source: security-advisories@github.com
Product Release Notes
https://github.com/MapServer/MapServer/security/advisories/GHSA-4g9f-ph64-hg2x
Source: security-advisories@github.com
Exploit Vendor Advisory
https://github.com/MapServer/MapServer/security/advisories/GHSA-4g9f-ph64-hg2x
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Exploit Vendor Advisory

3 reference(s) from NVD

Quick Stats

CVSS v3 Score
6.1 / 10.0
EPSS (Exploit Probability)
0.2%
16th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

Affected Vendors

osgeo