{"id":"CVE-2026-55778","revision":"d6625e2ce5534e54a151f9a52af2863e","records":[{"revision":"d6625e2ce5534e54a151f9a52af2863e","observedAt":"2026-10-27T15:15:14.036+00:00","statement":{"source":"nvd","id":"CVE-2026-55778","aliases":[],"title":"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-sta…","description":"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.","state":0,"publishedAt":"2026-07-08T21:16:50.387+00:00","modifiedAt":"2026-10-25T17:10:00.197+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"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","score":2.1,"severity":"LOW"}],"references":["https://github.com/parse-community/parse-server/commit/97c6a78d19f976ec756c1295f08a8fccab90799a","https://github.com/parse-community/parse-server/commit/be12a60d65b6e140481882037fb896b1f951df50","https://github.com/parse-community/parse-server/pull/10505","https://github.com/parse-community/parse-server/pull/10506","https://github.com/parse-community/parse-server/releases/tag/8.6.81","https://github.com/parse-community/parse-server/releases/tag/9.9.1-alpha.11","https://github.com/parse-community/parse-server/security/advisories/GHSA-v8x7-r927-cc93"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55778","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-434"],"productCriteria":[],"sourceDates":{"published":"2026-07-08T21:16:50.387","lastModified":"2026-10-25T17:10:00.197"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-55778","identifiers":["CVE-2026-55778"]},"retained":false,"historicalAffected":[]}],"coverage":[]}