Read the docs
TI-2026-30409 Aliases CVE-2026-42030

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

Priority MEDIUM 60CWE-80Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-80.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00247 16th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed MapServer (MapServer): 8.6.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
OSGeoMapServer6.0 to before 8.6.28.6.2Patch availableCNA
  • MapServer VendorOSGeo Affected 6.0 to before 8.6.2 Fixed in 8.6.2 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:osgeo:mapserver:*:*:*:*:*:*:*:*6.0.0 to before 8.6.2VulnerableOSGeo
  • cpe:2.3:a:osgeo:mapserver:*:*:*:*:*:*:*:* Versions 6.0.0 to before 8.6.2 Vulnerable ·OSGeo

Remediation

  • Fix · CNA MapServer (MapServer) Fixed in 8.6.2

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-42030

References

Exploit 1

Other 1

  • TI-2025-36983 MapServer - WFS XML Filter Query SQL injection CVSS 4.0HIGH 8.9
  • TI-2026-26100 MapServer has heap buffer overflow in SLD `Categorize` Threshold parsing CVSS 3.1HIGH 7.5
  • TI-2009-00797 Stack-based buffer overflow in mapserv.c in mapserv in MapServer 4.x before 4.10.4 and… CVSS 2.0HIGH 10.0
  • TI-2009-02173 Multiple heap-based buffer underflows in the readPostBody function in cgiutil.c in… CVSS 2.0HIGH 10.0
  • TI-2009-00799 Directory traversal vulnerability in mapserv.c in mapserv in MapServer 4.x before 4.10.4… CVSS 2.0HIGH 10.0
  • TI-2009-00798 Heap-based buffer underflow in the readPostBody function in cgiutil.c in mapserv in… CVSS 2.0HIGH 10.0
See all 21 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences