{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-127090", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-11-12T14:18:09.726Z", "datePublished": "2026-11-13T09:34:15.399Z", "dateUpdated": "2026-11-13T09:34:15.399Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-11-13T09:34:15.399Z"}, "datePublic": "2026-10-01T00:00:00.000Z", "title": "Jadaptive Maverick Synergy Server before 3.0.33 and 3.1.x before 3.1.7, and Maverick Legacy Server before 1.8.1, SSH Public Key Cross-User Authentication Bypass", "descriptions": [{"lang": "en", "value": "Jadaptive Maverick Synergy Server before 3.0.33 and 3.1.x before 3.1.7, and Maverick Legacy Server before 1.8.1, contain an authentication bypass vulnerability in SSH public key authentication that reuses cached key authorization decisions across usernames. Attackers holding a key authorized for one account can authenticate it, then send a signed SSH_MSG_USERAUTH_REQUEST with a different username on the same connection to log in as that account."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Authentication Bypass by Primary Weakness", "cweId": "CWE-305", "type": "CWE"}]}], "affected": [{"vendor": "Jadaptive", "product": "Maverick Synergy Server", "defaultStatus": "unaffected", "versions": [{"version": "0", "lessThan": "3.0.33", "status": "affected", "versionType": "semver"}, {"version": "3.1.0", "lessThan": "3.1.7", "status": "affected", "versionType": "semver"}], "packageURL": "pkg:maven/com.sshtools/maverick-synergy-server", "repo": "https://github.com/sshtools/maverick-synergy"}, {"vendor": "Jadaptive", "product": "Maverick Legacy Server", "defaultStatus": "unaffected", "versions": [{"version": "0", "lessThan": "1.8.1", "status": "affected", "versionType": "semver"}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 8.7, "baseSeverity": "HIGH"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH"}}], "references": [{"url": "https://jadaptive.com/security/advisories/JADAPTIVE-SA-2026-001", "tags": ["vendor-advisory"]}, {"url": "https://github.com/sshtools/maverick-synergy/commit/f7d23182cce985e21048215e96395881295cb0bd", "tags": ["patch"]}, {"url": "https://store.jadaptive.com/app/api/releases/changes/01d04a39-0f05-4bae-842e-d2f1acc16985", "tags": ["release-notes"], "name": "Maverick Synergy Release Notes"}, {"url": "https://store.jadaptive.com/app/api/releases/changes/ff71bdcf-a2a2-47e0-af5a-22e15af1dfa4", "tags": ["release-notes"], "name": "Maverick Legacy Server Release Notes"}, {"url": "https://github.com/sshtools/maverick-synergy/blob/3.1.4/maverick-base/src/main/java/com/sshtools/common/auth/PublicKeyAuthentication.java#L82-L100", "tags": ["technical-description"]}, {"url": "https://github.com/sshtools/maverick-synergy/blob/3.1.4/maverick-synergy-server/src/main/java/com/sshtools/server/AuthenticationProtocolServer.java#L185-L200", "tags": ["technical-description"]}, {"name": "VulnCheck Advisory: Jadaptive Maverick Synergy Server before 3.0.33 and 3.1.x before 3.1.7, and Maverick Legacy Server before 1.8.1, SSH Public Key Cross-User Authentication Bypass", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/jadaptive-maverick-synergy-server-before-3.0.33-and-3.1-x-before-3.1.7-and-maverick-legacy-server-before-1.8.1-ssh-public-key-cross-user-authentication-bypass"}], "credits": [{"lang": "en", "value": "Jadaptive Limited", "type": "finder"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "packageURL": "pkg:maven/com.sshtools/maverick-synergy-server", "product": "Maverick Synergy Server", "repo": "https://github.com/sshtools/maverick-synergy", "vendor": "Jadaptive", "versions": [{"lessThan": "3.0.33", "status": "affected", "version": "0", "versionType": "semver"}, {"lessThan": "3.1.7", "status": "affected", "version": "3.1.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "Maverick Legacy Server", "vendor": "Jadaptive", "versions": [{"lessThan": "1.8.1", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "disclosure@vulncheck.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Jadaptive Maverick Synergy Server before 3.0.33 and 3.1.x before 3.1.7, and Maverick Legacy Server before 1.8.1, contain an authentication bypass vulnerability in SSH public key authentication that reuses cached key authorization decisions across usernames. Attackers holding a key authorized for one account can authenticate it, then send a signed SSH_MSG_USERAUTH_REQUEST with a different username on the same connection to log in as that account."}], "id": "CVE-2026-127090", "lastModified": "2026-11-13T15:54:09.263", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "disclosure@vulncheck.com", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.7, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}]}, "published": "2026-11-13T10:18:05.620", "references": [{"source": "disclosure@vulncheck.com", "url": "https://github.com/sshtools/maverick-synergy/blob/3.1.4/maverick-base/src/main/java/com/sshtools/common/auth/PublicKeyAuthentication.java#L82-L100"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/sshtools/maverick-synergy/blob/3.1.4/maverick-synergy-server/src/main/java/com/sshtools/server/AuthenticationProtocolServer.java#L185-L200"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/sshtools/maverick-synergy/commit/f7d23182cce985e21048215e96395881295cb0bd"}, {"source": "disclosure@vulncheck.com", "url": "https://jadaptive.com/security/advisories/JADAPTIVE-SA-2026-001"}, {"source": "disclosure@vulncheck.com", "url": "https://store.jadaptive.com/app/api/releases/changes/01d04a39-0f05-4bae-842e-d2f1acc16985"}, {"source": "disclosure@vulncheck.com", "url": "https://store.jadaptive.com/app/api/releases/changes/ff71bdcf-a2a2-47e0-af5a-22e15af1dfa4"}, {"source": "disclosure@vulncheck.com", "url": "https://www.vulncheck.com/advisories/jadaptive-maverick-synergy-server-before-3.0.33-and-3.1-x-before-3.1.7-and-maverick-legacy-server-before-1.8.1-ssh-public-key-cross-user-authentication-bypass"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-305"}], "source": "disclosure@vulncheck.com", "type": "Primary"}]}

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