{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-87929", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-09-09T16:12:31.422Z", "datePublished": "2026-09-09T16:45:00.096Z", "dateUpdated": "2026-09-09T16:45:00.096Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-09-09T16:45:00.096Z"}, "datePublic": "2026-09-09T00:00:00.000Z", "title": "MaxSite CMS through 109.6 Authentication Bypass via Hardcoded Encryption Key", "descriptions": [{"lang": "en", "value": "MaxSite CMS through 109.6 ships with a hardcoded session encryption key in application/config/config.php that is never changed during installation, allowing unauthenticated attackers to forge administrator session cookies. Attackers can mint a malicious ci_session cookie with administrator privileges by computing an HMAC-SHA1 using the publicly known encryption key, bypassing authentication checks in is_login() and mso_check_allow() functions."}], "tags": ["x_open-source", "unsupported-when-assigned"], "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-321", "description": "Use of Hard-coded Cryptographic Key", "type": "CWE"}]}], "affected": [{"defaultStatus": "unaffected", "vendor": "MaxSite", "product": "MaxSite CMS", "packageURL": "pkg:github/maxsite/cms", "repo": "https://github.com/maxsite/cms", "versions": [{"version": "0.78", "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": "0.78", "versionEndIncluding": "109.6"}]}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "version": "4.0", "baseSeverity": "CRITICAL", "baseScore": 9.3, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}}, {"cvssV3_1": {"attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "version": "3.1", "baseSeverity": "CRITICAL", "baseScore": 9.8, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}}], "references": [{"url": "https://github.com/maxsite/cms", "tags": ["product"]}, {"url": "https://github.com/EviL0rd/maxsite-cve4/blob/main/2026.09.08-maxsite-cms-hardcoded-session-key-auth-bypass.md", "tags": ["exploit", "technical-description"]}, {"url": "https://github.com/maxsite/cms/blob/2ca0a0c7d1d71106a25dbb0f2aedaaefbf12802c/application/config/config.php#L230-L254", "tags": ["technical-description"]}, {"url": "https://github.com/maxsite/cms/blob/2ca0a0c7d1d71106a25dbb0f2aedaaefbf12802c/application/maxsite/common/core/init.php#L70-L96", "tags": ["technical-description"]}, {"name": "VulnCheck Advisory: MaxSite CMS through 109.6 Authentication Bypass via Hardcoded Encryption Key", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/maxsite-cms-through-109.6-authentication-bypass-via-hardcoded-encryption-key"}], "credits": [{"lang": "en", "value": "EVIL0RD", "type": "reporter"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "vulncheck-endgame"}}}}

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