Vulnerability Report

CVE-2026-42030

Title: Reflected XSS in MapServer WMS Server

XSS

Proof Of Concept

No public PoC currently indexed for CVE-2026-42030.

CWE Category CWE-80

Published Date May 08, 2026

Modified Date May 14, 2026

Exploit Status Not Found

Score 6.1 CVSS v3.1

Exploit Probability (EPSS)

0.02%

Vulnerability Summary

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.

Impacted Vendors

university_of_minnesota 1

osgeo 1

Reference Links

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

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

6.1

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

REQUIRED

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

CHANGED

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

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-42030 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

May 14, 2026 MODIFIED

Vulnerability data updated via NVD.

May 13, 2026 MODIFIED

Vulnerability data updated via NVD.

May 08, 2026 MODIFIED

Vulnerability data updated via NVD.

May 08, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction REQUIRED

CVSS Vector String


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

Affected Stack

No specific products linked.