Medium
mapserver — security advisory
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.
- Products
- mapserver
- Affected versions
- 7.0.0-4build1, 7.0.0-5ubuntu1, 7.0.0-7, 7.0.0-8, 7.0.0-8build1, 7.0.0-9, 7.0.0-9ubuntu1, 7.0.0-9ubuntu2, 7.0.0-9ubuntu3, 7.0.0-9ubuntu3.1, 7.0.6-2build1, 7.0.7-1, 7.0.7-1build1, 7.0.7-1build2, 7.4.1-1build1, 7.4.1-1build3, 7.4.2-1, 7.4.2-1build1, 7.4.3-1, 7.4.3-1build2, 7.4.3-2, 7.4.3-2build1, 7.6.3-1~exp1ubuntu1, 7.6.4-2, 7.6.4-2build2, 8.0.1-2build1, 8.0.1-2build2, 8.0.1-2build3, 8.0.1-2build5, 8.0.1-4ubuntu1, 8.0.1-4ubuntu2, 8.4.0-1build1, 8.4.0-4, 8.4.0-4build1, 8.4.1-1, 8.4.1-1build1, 8.4.1-2, 8.4.1-2build1, 8.6.0-1, 8.6.0-1build1, 8.6.4-1, 8.6.5-1, 8.6.5-1build1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-42030
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:03 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-42030
mapserver
Fixed versions: Not specified
mapserver
Fixed versions: Not specified
mapserver
Fixed versions: Not specified
mapserver
Fixed versions: Not specified
mapserver
Fixed versions: Not specified
mapserver
Fixed versions: Not specified
mapserver
Fixed versions: Not specified
mapserver
Fixed versions: Not specified
Complete source record
{
"id": "856130ebe4243db8959739f7537de0a5b2544a98b378b091e75ed0e9101bc696",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-42030",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-42030",
"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.",
"evidence": "osv:UBUNTU-CVE-2026-42030",
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{
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"evidence": "/affected/4/versions"
},
{
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"evidence": "/affected/4/versions"
},
{
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{
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{
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{
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{
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{
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"evidence": "/affected/7/versions"
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{
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"evidence": "/affected/7/versions"
},
{
"value": "8.4.1-2",
"evidence": "/affected/7/versions"
},
{
"value": "8.4.1-2build1",
"evidence": "/affected/7/versions"
},
{
"value": "8.6.0-1",
"evidence": "/affected/7/versions"
},
{
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],
"severity": "medium",
"structured": {
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"aliases": [
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],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
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{
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},
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},
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},
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},
{
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},
{
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}
]
}
}
],
"modified": "2026-10-17T13:00:05.116573575Z",
"provider": "osv",
"upstream": [
"CVE-2026-42030"
],
"references": [
"https://ubuntu.com/security/CVE-2026-42030",
"https://www.cve.org/CVERecord?id=CVE-2026-42030",
"https://github.com/MapServer/MapServer/security/advisories/GHSA-4g9f-ph64-hg2x",
"https://github.com/MapServer/MapServer/releases/tag/rel-8-6-2"
]
},
"related_cves": [
{
"value": "CVE-2026-42030",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 360284,
"published_at": "2026-05-08T17:16:00+00:00"
}