CVE-2026-61448

Low

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.

SeverityLow

CVSS2.1

Exploit probability—

ProductParse-server

PublishedJul 11, 2026

First seenJul 11, 2026

Weakness typeCWE-434Unrestricted upload of dangerous file type

How to fix

Update

parse-server9.10.0-alpha.2, 8.6.84 or later

Vendor advisories

github.com/parse-community/parse-server/security/advisories/GHSA-r899-h629-j84r

Affected products

Product	Affected versions	Fixed in
parse-servernpm	9.0.0 ≤ v < 9.10.0-alpha.2, v ≤ 8.6.83	9.10.0-alpha.2, 8.6.84

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