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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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:8d98fef5a77d0a20cd7837329152194bdc1dd54d88c2379a6c33e65230d30d93
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"MapServer","vendor":"MapServer","versions":[{"status":"affected","version":">= 6.0, < 8.6.2"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:fa76141c0e75ff33668b1dca1bf639637d359916308db5c45e75d5a24600a63f · sha256:60a502486a082381… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:fa76141c0e75ff33668b1dca1bf639637d359916308db5c45e75d5a24600a63f · sha256:60a502486a082381… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-80","description":"CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:fa76141c0e75ff33668b1dca1bf639637d359916308db5c45e75d5a24600a63f · sha256:60a502486a082381… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/MapServer/MapServer/releases/tag/rel-8-6-2","tags":["x_refsource_MISC"],"url":"https://github.com/MapServer/MapServer/releases/tag/rel-8-6-2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:fa76141c0e75ff33668b1dca1bf639637d359916308db5c45e75d5a24600a63f · sha256:60a502486a082381… · /containers/cna/references/1
{"name":"https://github.com/MapServer/MapServer/security/advisories/GHSA-4g9f-ph64-hg2x","tags":["x_refsource_CONFIRM"],"url":"https://github.com/MapServer/MapServer/security/advisories/GHSA-4g9f-ph64-hg2x"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:fa76141c0e75ff33668b1dca1bf639637d359916308db5c45e75d5a24600a63f · sha256:60a502486a082381… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/MapServer/MapServer/security/advisories/GHSA-4g9f-ph64-hg2x"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:fa76141c0e75ff33668b1dca1bf639637d359916308db5c45e75d5a24600a63f · sha256:60a502486a082381… · /containers/adp/0/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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