{"id":"EUVD-2026-43183","revision":"42bdb5d628274ec1af74d15e3402f90e","records":[{"revision":"42bdb5d628274ec1af74d15e3402f90e","observedAt":"2026-11-04T19:04:43.747+00:00","statement":{"source":"euvd","id":"EUVD-2026-43183","aliases":["CVE-2026-61448","GHSA-p6c5-mjgj-m4rm","GHSA-r899-h629-j84r"],"title":"Parse Server is affected by a stored cross-site scripting (XSS) vulnerability in versions >= 9.0.0, < 9.10.0-alpha.2 and <= 8.6.83. When an uploaded file's extension is not recognized by the mime package, Parse Server preserves the client-s…","description":"Parse Server is affected by a stored cross-site scripting (XSS) vulnerability in versions >= 9.0.0, < 9.10.0-alpha.2 and <= 8.6.83. When an uploaded file's extension is not recognized by the mime package, Parse Server preserves the client-supplied Content-Type. A malformed Content-Type that is not a valid type/subtype media type (e.g., 'image', 'image/', or 'image//svg+xml') bypasses the fileUpload.fileExtensions blocklist and is stored unchanged. On storage adapters that persist and serve the uploaded Content-Type (such as Amazon S3, Google Cloud Storage, or Azure Blob Storage), a browser cannot parse the malformed value and falls back to MIME-sniffing; a file whose body begins with HTML is rendered as HTML, executing embedded script in the application's origin against other users who open the file URL. The default GridFS storage adapter is not affected. Fixed in 9.10.0-alpha.2 and 8.6.84.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD 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":null}],"references":["https://github.com/parse-community/parse-server/security/advisories/GHSA-r899-h629-j84r","https://www.vulncheck.com/advisories/parse-server-stored-xss-via-malformed-content-type"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-43183","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Jul 11, 2026, 1:01:05 PM","dateUpdated":"Jul 14, 2026, 10:03:36 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-43183","identifiers":["EUVD-2026-43183","CVE-2026-61448","GHSA-p6c5-mjgj-m4rm","GHSA-r899-h629-j84r"]},"retained":false,"historicalAffected":[]}],"coverage":[]}