Vulnerability 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.
Related Weaknesses (CWE)
References
- https://github.com/parse-community/parse-server/security/advisories/GHSA-r899-h6
- https://www.vulncheck.com/advisories/parse-server-stored-xss-via-malformed-conte
FAQ
What is CVE-2026-61448?
CVE-2026-61448 is a documented vulnerability. 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 pack...
How severe is CVE-2026-61448?
CVSS scoring is not yet available for CVE-2026-61448. Check NVD for updates.
Is there a patch for CVE-2026-61448?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.