CVE-2026-61448

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.

CVSS

No CVSS.

References

Link	Resource
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

Configurations

No configuration.

History

No history.

Information

Published : 2026-07-11 14:16

Updated : 2026-07-13 20:03

NVD link : CVE-2026-61448

Mitre link : CVE-2026-61448

CVE.ORG link : CVE-2026-61448

JSON object : View

Products Affected

No product.

CWE

CWE-434

Unrestricted Upload of File with Dangerous Type

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