{"id":"CVE-2026-55778","revision":"0339a7f63dfe45d495f739ee0952a57b","records":[{"revision":"0339a7f63dfe45d495f739ee0952a57b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-55778","aliases":[],"title":"Parse Server: Stored XSS via non-standard file extension bypassing file upload extension blocklist","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":"2026-07-08T20:50:52.531+00:00","modifiedAt":"2026-07-09T13:39:44.881+00:00","affected":[{"ecosystem":"Vendor product","name":"parse-server","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"parse-community\",\n                    \"product\": \"parse-server\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 9.0.0-alpha.1, < 9.9.1-alpha.11\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"< 8.6.81\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","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","score":2.1,"severity":"LOW"}],"references":["https://github.com/parse-community/parse-server/security/advisories/GHSA-v8x7-r927-cc93","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/commit/97c6a78d19f976ec756c1295f08a8fccab90799a","https://github.com/parse-community/parse-server/commit/be12a60d65b6e140481882037fb896b1f951df50","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"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-55778","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-55778","identifiers":["CVE-2026-55778"]},"retained":false,"historicalAffected":[]}],"coverage":[]}