Bug 2468309 (CVE-2026-42030)

Summary: CVE-2026-42030 MapServer: OpenLayers: MapServer: Reflected Cross-Site Scripting (XSS) via unsanitized WMS parameter
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in MapServer, a system for developing web-based Geographic Information System (GIS) applications. A reflected Cross-Site Scripting (XSS) vulnerability in MapServer's Web Map Service (WMS) server allows an unauthenticated attacker to inject arbitrary HTML or JavaScript code into the browser of a user who opens a specially crafted WMS URL. This vulnerability is triggered by combining FORMAT=application/openlayers with an unsanitized SRS parameter in WMS 1.3.0 requests, potentially leading to information disclosure or other client-side attacks.
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Bug Depends On: 2477882    
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Description OSIDB Bzimport 2026-05-08 17:01:38 UTC
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.