{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-87928", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-09-09T16:12:25.344Z", "datePublished": "2026-09-09T16:44:59.356Z", "dateUpdated": "2026-09-09T16:44:59.356Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-09-09T16:44:59.356Z"}, "datePublic": "2026-09-09T00:00:00.000Z", "title": "MaxSite CMS 0.94 through 109.6 HTML Upload XSS via admin_page", "descriptions": [{"lang": "en", "value": "MaxSite CMS versions 0.94 through 109.6 contain a cross-site scripting vulnerability in the admin_page upload handler that allows any logged-in user to upload HTML files. Attackers can upload HTML containing malicious scripts to the uploads/_pages/ directory, which executes in visitors' browsers when the file is accessed, enabling persistent stored cross-site scripting attacks."}], "tags": ["x_open-source", "unsupported-when-assigned"], "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-434", "description": "Unrestricted Upload of File with Dangerous Type", "type": "CWE"}]}], "affected": [{"defaultStatus": "unaffected", "vendor": "MaxSite", "product": "MaxSite CMS", "packageURL": "pkg:github/maxsite/cms", "repo": "https://github.com/maxsite/cms", "versions": [{"version": "0.94", "lessThanOrEqual": "109.6", "status": "affected", "versionType": "custom"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:max-3000:maxsite_cms:*:*:*:*:*:*:*:*", "versionStartIncluding": "0.94", "versionEndIncluding": "109.6"}]}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "version": "4.0", "baseSeverity": "MEDIUM", "baseScore": 5.1, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"}}, {"cvssV3_1": {"attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE", "version": "3.1", "baseSeverity": "MEDIUM", "baseScore": 5.4, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"}}], "references": [{"url": "https://github.com/maxsite/cms", "tags": ["product"]}, {"url": "https://github.com/EviL0rd/maxsite-cve2/blob/main/2026.09.08-maxsite-cms-arbitrary-file-write-stored-xss.md", "tags": ["exploit", "technical-description"]}, {"url": "https://github.com/maxsite/cms/blob/2ca0a0c7d1d71106a25dbb0f2aedaaefbf12802c/application/maxsite/admin/plugins/admin_page/uploads-require-maxsite.php#L1-L64", "tags": ["technical-description"]}, {"name": "VulnCheck Advisory: MaxSite CMS 0.94 through 109.6 HTML Upload XSS via admin_page", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/maxsite-cms-0.94-through-109.6-html-upload-xss-via-admin-page"}], "credits": [{"lang": "en", "value": "EVIL0RD", "type": "reporter"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "vulncheck-endgame"}}}}

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