{"id":"CVE-2026-55778","sourceIdentifier":"security-advisories@github.com","published":"2026-07-08T21:16:50.387","lastModified":"2026-10-25T17:10:00.197","vulnStatus":"Deferred","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 9.9.1-alpha.11 and 8.6.81, the default fileUpload.fileExtensions blocklist could be bypassed by uploading a file with a non-standard or compound extension and dangerous content type, allowing storage adapters such as S3 and GCS to serve attacker-supplied active content and enable stored cross-site scripting. This issue is fixed in versions 9.9.1-alpha.11 and 8.6.81."},{"lang":"es","value":"Parse Server es un backend de código abierto que puede ser desplegado en cualquier infraestructura que pueda ejecutar Node.js. Antes de las versiones 9.9.1-alpha.11 y 8.6.81, la lista de bloqueo predeterminada fileUpload.fileExtensions podía ser eludida al subir un archivo con una extensión no estándar o compuesta y un tipo de contenido peligroso, permitiendo que adaptadores de almacenamiento como S3 y GCS sirvieran contenido activo suministrado por el atacante y habilitaran cross-site scripting almacenado. Este problema está solucionado en las versiones 9.9.1-alpha.11 y 8.6.81."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"parse-community","product":"parse-server","versions":[{"version":">= 9.0.0-alpha.1, < 9.9.1-alpha.11","status":"affected"},{"version":"< 8.6.81","status":"affected"}]}]}],"metrics":{"cvssMetricV40":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/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","baseScore":2.1,"baseSeverity":"LOW","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"LOW","userInteraction":"PASSIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-07-09T13:39:32.908358Z","id":"CVE-2026-55778","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-434"}]}],"references":[{"url":"https://github.com/parse-community/parse-server/commit/97c6a78d19f976ec756c1295f08a8fccab90799a","source":"security-advisories@github.com"},{"url":"https://github.com/parse-community/parse-server/commit/be12a60d65b6e140481882037fb896b1f951df50","source":"security-advisories@github.com"},{"url":"https://github.com/parse-community/parse-server/pull/10505","source":"security-advisories@github.com"},{"url":"https://github.com/parse-community/parse-server/pull/10506","source":"security-advisories@github.com"},{"url":"https://github.com/parse-community/parse-server/releases/tag/8.6.81","source":"security-advisories@github.com"},{"url":"https://github.com/parse-community/parse-server/releases/tag/9.9.1-alpha.11","source":"security-advisories@github.com"},{"url":"https://github.com/parse-community/parse-server/security/advisories/GHSA-v8x7-r927-cc93","source":"security-advisories@github.com"}]}