{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-27804", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-02-24T02:31:33.266Z", "datePublished": "2026-02-25T23:48:20.858Z", "dateUpdated": "2026-02-26T17:03:50.903Z"}, "containers": {"cna": {"title": "Parse Server: Account takeover via JWT algorithm confusion in Google auth adapter", "problemTypes": [{"descriptions": [{"cweId": "CWE-327", "lang": "en", "description": "CWE-327: Use of a Broken or Risky Cryptographic Algorithm", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-345", "lang": "en", "description": "CWE-345: Insufficient Verification of Data Authenticity", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 9.3, "baseSeverity": "CRITICAL", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/parse-community/parse-server/security/advisories/GHSA-4q3h-vp4r-prv2", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/parse-community/parse-server/security/advisories/GHSA-4q3h-vp4r-prv2"}, {"name": "https://github.com/parse-community/parse-server/commit/9b94083accb7f3e72c6b8126c195c7a03dd2dfd7", "tags": ["x_refsource_MISC"], "url": "https://github.com/parse-community/parse-server/commit/9b94083accb7f3e72c6b8126c195c7a03dd2dfd7"}, {"name": "https://github.com/parse-community/parse-server/commit/9d5942d50e55c822924c27b05aa98f1393e7a330", "tags": ["x_refsource_MISC"], "url": "https://github.com/parse-community/parse-server/commit/9d5942d50e55c822924c27b05aa98f1393e7a330"}, {"name": "https://github.com/parse-community/parse-server/releases/tag/8.6.3", "tags": ["x_refsource_MISC"], "url": "https://github.com/parse-community/parse-server/releases/tag/8.6.3"}, {"name": "https://github.com/parse-community/parse-server/releases/tag/9.3.1-alpha.4", "tags": ["x_refsource_MISC"], "url": "https://github.com/parse-community/parse-server/releases/tag/9.3.1-alpha.4"}], "affected": [{"vendor": "parse-community", "product": "parse-server", "versions": [{"version": ">= 9.0.0, < 9.3.1-alpha.4", "status": "affected"}, {"version": "< 8.6.3", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-02-25T23:48:20.858Z"}, "descriptions": [{"lang": "en", "value": "Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.3 and 9.1.1-alpha.4, an unauthenticated attacker can forge a Google authentication token with `alg: \"none\"` to log in as any user linked to a Google account, without knowing their credentials. All deployments with Google authentication enabled are affected. The fix in versions 8.6.3 and 9.1.1-alpha.4 hardcodes the expected `RS256` algorithm instead of trusting the JWT header, and replaces the Google adapter's custom key fetcher with `jwks-rsa` which rejects unknown key IDs. As a workaround, dsable Google authentication until upgrading is possible."}], "source": {"advisory": "GHSA-4q3h-vp4r-prv2", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-02-26T17:03:17.987949Z", "id": "CVE-2026-27804", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-02-26T17:03:50.903Z"}}]}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.3 and 9.1.1-alpha.4, an unauthenticated attacker can forge a Google authentication token with `alg: \"none\"` to log in as any user linked to a Google account, without knowing their credentials. All deployments with Google authentication enabled are affected. The fix in versions 8.6.3 and 9.1.1-alpha.4 hardcodes the expected `RS256` algorithm instead of trusting the JWT header, and replaces the Google adapter's custom key fetcher with `jwks-rsa` which rejects unknown key IDs. As a workaround, dsable Google authentication until upgrading is possible."}], "id": "CVE-2026-27804", "lastModified": "2026-02-26T00:16:25.793", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 9.3, "baseSeverity": "CRITICAL", "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": "NONE", "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:N/UI:N/VC:H/VI:H/VA:N/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": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-02-26T00:16:25.793", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/parse-community/parse-server/commit/9b94083accb7f3e72c6b8126c195c7a03dd2dfd7"}, {"source": "security-advisories@github.com", "url": "https://github.com/parse-community/parse-server/commit/9d5942d50e55c822924c27b05aa98f1393e7a330"}, {"source": "security-advisories@github.com", "url": "https://github.com/parse-community/parse-server/releases/tag/8.6.3"}, {"source": "security-advisories@github.com", "url": "https://github.com/parse-community/parse-server/releases/tag/9.3.1-alpha.4"}, {"source": "security-advisories@github.com", "url": "https://github.com/parse-community/parse-server/security/advisories/GHSA-4q3h-vp4r-prv2"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-327"}, {"lang": "en", "value": "CWE-345"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.0.0,9.3.1-alpha.4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,8.6.3)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "parse-server", "source": "cna", "vendor": "parse-community"}, "product": "parse_server", "vendor": "parse_community"}], "created": "2026-02-26T13:10:30.083261+00:00", "updated": "2026-02-26T13:10:30.083347+00:00", "vendors": ["parse_community", "parse_community$PRODUCT$parse_server"]}