{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-90800", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "state": "PUBLISHED", "assignerShortName": "apache", "dateReserved": "2026-09-13T15:07:31.018Z", "datePublished": "2026-10-20T15:40:47.497Z", "dateUpdated": "2026-10-20T15:40:47.497Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-10-20T15:40:47.497Z"}, "title": "Apache CouchDB: Auth bypass in prefixed _users and _replicator databases", "source": {"discovery": "UNKNOWN"}, "affected": [{"vendor": "Apache Software Foundation", "product": "Apache CouchDB", "versions": [{"status": "affected", "version": "0", "lessThan": "3.5.3", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"value": "Missing authorisation checks in chttpd in Apache CouchDB 3.5.2 and below on all platforms allows any request to read the full contents of a prefixed _user or _replicator database via an unauthorised API endpoint.\n\n\nThe use of prefixed system databases is very rare.\n\nUsers are recommended to upgrade to version 3.5.3, which fixes this issue.", "lang": "en", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Missing authorisation checks in chttpd in Apache CouchDB 3.5.2 and below on all platforms allows any request to read the full contents of a prefixed _user or _replicator database via an unauthorised API endpoint.<div><br></div><div>The use of prefixed system databases is very rare.<br><br><div>Users are recommended to upgrade to version 3.5.3, which fixes this issue.</div></div>"}]}], "references": [{"url": "https://lists.apache.org/thread.html/pj83174r8f8f64odf47fwhozbfjtot0f", "tags": ["release-notes"]}, {"url": "https://lists.apache.org/thread/vng8vqjwgy1qlrv14wzrgs7pv4gj7gwr", "tags": ["vendor-advisory"]}], "metrics": [{"scenarios": [{"lang": "en", "value": "GENERAL"}], "format": "CVSS", "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "UNREPORTED", "Safety": "NEGLIGIBLE", "Automatable": "YES", "Recovery": "USER", "valueDensity": "CONCENTRATED", "vulnerabilityResponseEffort": "MODERATE", "providerUrgency": "AMBER", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 8.1, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:U/S:N/AU:Y/R:U/V:C/RE:M/U:Amber"}}], "credits": [{"lang": "en", "value": "Qing Xu & ZeroVuln Labs reported this issue independently", "type": "reporter"}], "x_generator": {"engine": "Vulnogram 1.0.3"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Apache CouchDB", "vendor": "Apache Software Foundation", "versions": [{"lessThan": "3.5.3", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "security@apache.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Missing authorisation checks in chttpd in Apache CouchDB 3.5.2 and below on all platforms allows any request to read the full contents of a prefixed _user or _replicator database via an unauthorised API endpoint.\n\n\nThe use of prefixed system databases is very rare.\n\nUsers are recommended to upgrade to version 3.5.3, which fixes this issue."}], "id": "CVE-2026-90800", "lastModified": "2026-10-20T16:17:16.033", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "YES", "Recovery": "USER", "Safety": "NEGLIGIBLE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "UNREPORTED", "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": "NONE", "providerUrgency": "AMBER", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "userInteraction": "NONE", "valueDensity": "CONCENTRATED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:U/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:N/AU:Y/R:U/V:C/RE:M/U:Amber", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "MODERATE"}, "source": "security@apache.org", "type": "Secondary"}]}, "published": "2026-10-20T16:17:16.033", "references": [{"source": "security@apache.org", "url": "https://lists.apache.org/thread.html/pj83174r8f8f64odf47fwhozbfjtot0f"}, {"source": "security@apache.org", "url": "https://lists.apache.org/thread/vng8vqjwgy1qlrv14wzrgs7pv4gj7gwr"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Received"}

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