{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-43639", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-05-01T18:22:45.642Z", "datePublished": "2026-05-11T17:14:04.552Z", "dateUpdated": "2026-05-11T17:14:04.552Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-05-11T17:14:04.552Z"}, "title": "Bitwarden Server < 2026.4.0 Missing Authorization via Provider Clients", "descriptions": [{"lang": "en", "value": "Bitwarden Server prior to v2026.4.0 contains a missing authorization vulnerability that allows a provider service user to add an arbitrary organization to their provider via `POST /providers/{providerId}/clients/existing`, resulting in takeover of the target organization; self-hosted installations are unaffected as this endpoint is restricted to Cloud via SelfHosted(NotSelfHostedOnly = true)."}], "tags": ["x_open-source"], "datePublic": "2026-04-21T00:00:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-862", "description": "Missing Authorization", "type": "CWE"}]}], "affected": [{"defaultStatus": "affected", "vendor": "bitwarden", "product": "server", "versions": [{"status": "affected", "version": "0", "versionType": "semver", "lessThan": "2026.4.0"}], "repo": "https://github.com/bitwarden/server"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "NONE", "privilegesRequired": "HIGH", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "HIGH", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 8.9, "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "version": "3.1", "baseSeverity": "HIGH", "baseScore": 8, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H"}}], "references": [{"url": "https://sanjokkarki.com.np/blog/bitwarden-provider-takeover", "tags": ["technical-description", "exploit"]}, {"url": "https://github.com/bitwarden/server/releases/tag/v2026.4.0", "tags": ["release-notes"]}, {"url": "https://github.com/bitwarden/server/pull/7372", "tags": ["issue-tracking"]}, {"url": "https://github.com/bitwarden/server/commit/0918bfdda6f5eec391c69bd9074f6aef4eac0b1d", "tags": ["patch"]}, {"url": "https://www.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-provider-clients", "tags": ["third-party-advisory"]}], "credits": [{"lang": "en", "value": "Sanjok Karki", "type": "finder"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "vulncheck"}}}}

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