{"id":"EUVD-2026-43183","enisaUuid":"dabfcd1e-5230-35bb-9ec1-0c335533f044","description":"Parse Server vulnerable to stored XSS via malformed Content-Type bypassing file upload extension blocklist","datePublished":"Oct 29, 2026, 4:33:48 PM","dateUpdated":"Oct 29, 2026, 4:33:48 PM","baseScore":2.1,"baseScoreVersion":"4.0","baseScoreVector":"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","references":"https://github.com/parse-community/parse-server/security/advisories/GHSA-r899-h629-j84r\nhttps://www.vulncheck.com/advisories/parse-server-stored-xss-via-malformed-content-type\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-61448\n","aliases":"CVE-2026-61448\nGHSA-p6c5-mjgj-m4rm\nGHSA-r899-h629-j84r\n","assigner":"VulnCheck","epss":0.42,"enisaIdProduct":[{"id":"50917e74-f9be-350c-9d9e-09da38161276","product":{"name":"parse-server","vendor":{"name":"parse-community"}},"product_version":"9.0.0 \u003c9.10.0-alpha.2"},{"id":"5651aaf1-5c29-3b04-bab2-7ee0b2a5401b","product":{"name":"parse-server","vendor":{"name":"parse-community"}},"product_version":"0 \u003c8.6.84"}],"enisaIdVendor":[{"id":"0091e65d-d431-380f-9316-11789009937a","vendor":{"name":"parse-community"}}],"enisaIdVulnerability":[{"id":"0fd62ec4-d510-3a69-9094-cb95ed080e67","vulnerability":{"id":"CVE-2026-61448","description":"Parse Server is affected by a stored cross-site scripting (XSS) vulnerability in versions \u003e\u003d 9.0.0, \u003c 9.10.0-alpha.2 and \u003c\u003d 8.6.83. When an uploaded file\u0027s 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., \u0027image\u0027, \u0027image/\u0027, or \u0027image//svg+xml\u0027) 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\u0027s 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.","datePublished":"Jul 11, 2026, 1:01:05 PM","dateUpdated":"Jul 14, 2026, 10:03:36 PM","status":"PUBLISHED","baseScore":2.1,"baseScoreVersion":"4.0","baseScoreVector":"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","references":"https://github.com/parse-community/parse-server/security/advisories/GHSA-r899-h629-j84r\nhttps://www.vulncheck.com/advisories/parse-server-stored-xss-via-malformed-content-type\n","enisa_id":"EUVD-2026-43183\n","assigner":"VulnCheck","epss":0.42,"dataProcessed":"Oct 31, 2026, 7:15:15 AM","vulnerabilityProduct":[{"id":"022031a9-7888-3b12-b5e1-5301d8fad5f3","product":{"name":"parse-server","vendor":{"name":"parse-community"}},"product_version":"0 \u003c8.6.84"},{"id":"3ec9a515-7855-3c1c-b791-ecb068a6226c","product":{"name":"parse-server","vendor":{"name":"parse-community"}},"product_version":"9.0.0 \u003c9.10.0-alpha.2"}],"vulnerabilityVendor":[{"id":"cc7b2d2c-77fd-32b8-a93d-1f791b890bc5","vendor":{"name":"parse-community"}}]}},{"id":"14317eca-7134-387d-b0e0-d5b0126796dc","vulnerability":{"id":"GHSA-r899-h629-j84r","description":"Parse Server vulnerable to stored XSS via malformed Content-Type bypassing file upload extension blocklist","datePublished":"Oct 29, 2026, 4:33:48 PM","dateUpdated":"Oct 29, 2026, 4:33:48 PM","baseScore":0.0,"references":"https://github.com/parse-community/parse-server/security/advisories/GHSA-r899-h629-j84r\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-61448\nhttps://github.com/parse-community/parse-server\nhttps://www.vulncheck.com/advisories/parse-server-stored-xss-via-malformed-content-type\n","enisa_id":"EUVD-2026-43183\n","aliases":"GHSA-r899-h629-j84r\nCVE-2026-61448\n","epss":0.0,"dataProcessed":"Oct 31, 2026, 8:01:36 PM","vulnerabilityProduct":[],"vulnerabilityVendor":[]}},{"id":"c362839f-29f8-32dc-8665-6074ab5de9cb","vulnerability":{"id":"GHSA-p6c5-mjgj-m4rm","description":"Duplicate Advisory: Parse Server vulnerable to stored XSS via malformed Content-Type bypassing file upload extension blocklist","datePublished":"Jul 11, 2026, 3:30:23 PM","dateUpdated":"Oct 29, 2026, 4:33:41 PM","baseScore":0.0,"references":"https://github.com/parse-community/parse-server/security/advisories/GHSA-r899-h629-j84r\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-61448\nhttps://www.vulncheck.com/advisories/parse-server-stored-xss-via-malformed-content-type\n","enisa_id":"EUVD-2026-43183\n","aliases":"GHSA-p6c5-mjgj-m4rm\n","epss":0.0,"dataProcessed":"Oct 31, 2026, 8:01:36 PM","vulnerabilityProduct":[],"vulnerabilityVendor":[]}}],"enisaIdAdvisory":[]}