CVE•Published 2026-05-08•Modified 2026-05-14•0 articles on news•5 live references•NVD data

CVE-2026-42030Osgeo · Mapserver

Vulnerability data via NVD (ingested)

CVSS v3.1

6.1

MEDIUM

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

EPSS percentile

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Weaknesses (CWE)

CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

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.

Timeline

Published 2026-05-08

Modified 2026-05-14

External references

NVD MITRE Exploit-DB Sploitus VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-42030

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Osgeo Mapserver"

All exposed Osgeo Mapserver instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Mapserver"

HTTP body or banner mentions "Mapserver" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-42030