{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-54355",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-06-12T19:23:22.318Z",
        "datePublished": "2026-09-17T20:24:32.522Z",
        "dateUpdated": "2026-09-24T20:45:56.071Z"
    },
    "containers": {
        "cna": {
            "title": "MapServer: Reflected XSS in OpenLayers HTML Output via `HTTP_X_FORWARDED_HOST`",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-79",
                            "lang": "en",
                            "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "PRESENT",
                        "privilegesRequired": "NONE",
                        "userInteraction": "PASSIVE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "HIGH",
                        "subIntegrityImpact": "HIGH",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 5.3,
                        "baseSeverity": "MEDIUM",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/MapServer/MapServer/security/advisories/GHSA-xqj6-vjqr-33vv",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/MapServer/MapServer/security/advisories/GHSA-xqj6-vjqr-33vv"
                },
                {
                    "name": "https://github.com/MapServer/MapServer/pull/7517",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/MapServer/MapServer/pull/7517"
                },
                {
                    "name": "https://github.com/MapServer/MapServer/pull/7518",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/MapServer/MapServer/pull/7518"
                },
                {
                    "name": "https://github.com/MapServer/MapServer/commit/edc1033c7963fcffd160d85cf430f49aaf4a1374",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/MapServer/MapServer/commit/edc1033c7963fcffd160d85cf430f49aaf4a1374"
                },
                {
                    "name": "https://github.com/MapServer/MapServer/commit/ff17ef190caaeaa9002ac3d1c7969ec5315c345e",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/MapServer/MapServer/commit/ff17ef190caaeaa9002ac3d1c7969ec5315c345e"
                },
                {
                    "name": "https://github.com/MapServer/MapServer/releases/tag/rel-8-6-4",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/MapServer/MapServer/releases/tag/rel-8-6-4"
                },
                {
                    "name": "https://mapserver.org/development/changelog/changelog-8-6.html#changelog-8-6",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://mapserver.org/development/changelog/changelog-8-6.html#changelog-8-6"
                }
            ],
            "affected": [
                {
                    "vendor": "MapServer",
                    "product": "MapServer",
                    "versions": [
                        {
                            "version": ">= 6.0, < 8.6.4",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-09-17T20:24:32.522Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "MapServer is a system for developing web-based GIS applications. From 6.0 until 8.6.4, MapServer's OpenLayers HTML output for SERVICE=WMS&REQUEST=GetMap&FORMAT=application/openlayers reflects an attacker-controlled X-Forwarded-Host value received as HTTP_X_FORWARDED_HOST through msBuildOnlineResource(), processLine(), and the [mapserv_onlineresource] substitution in src/maputil.c and src/maptemplate.c without escaping it for a single-quoted JavaScript string. When the deployment trusts the forwarded header and does not configure a fixed ows_onlineresource or MS_ONLINERESOURCE value, embedded single quotes can escape the generated URL string. An unauthenticated attacker can craft a URL that executes arbitrary JavaScript in the MapServer site origin when opened by a victim, enabling access to sessions or tokens, same-origin data and requests, and actions as the victim. This issue is fixed in version 8.6.4."
                }
            ],
            "source": {
                "advisory": "GHSA-xqj6-vjqr-33vv",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "references": [
                    {
                        "url": "https://github.com/MapServer/MapServer/security/advisories/GHSA-xqj6-vjqr-33vv",
                        "tags": [
                            "exploit"
                        ]
                    }
                ],
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-09-24T20:45:53.514616Z",
                                "id": "CVE-2026-54355",
                                "options": [
                                    {
                                        "Exploitation": "poc"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-09-24T20:45:56.071Z"
                }
            }
        ]
    }
}