CVE-2026-61448 parse-community CVE debrief

Who should care

Developers and administrators using Parse Server versions >= 9.0.0, < 9.10.0-alpha.2 and <= 8.6.83 should be aware of this vulnerability and take steps to mitigate it. They should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. They should also verify and validate user-supplied Content-Type headers and implement additional security measures for storage adapters.

Technical summary

The vulnerability occurs when an uploaded file's extension is not recognized by the mime package, allowing a malformed Content-Type to bypass the fileUpload.fileExtensions blocklist and be 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 may render a file whose body begins with HTML 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.

Defensive priority

Low

Recommended defensive actions

• Update to version 9.10.0-alpha.2 or 8.6.84
• Verify and validate user-supplied Content-Type headers
• Implement additional security measures for storage adapters
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-07-11T14:16:23.510Z and has not been modified since then. The NVD entry is currently Received. There is limited evidence available about the vulnerability, and defenders should verify the affected scope and severity with the vendor. The vulnerability occurs in Parse Server versions >= 9.0.0, < 9.10.0-alpha.2 and <= 8.6.83, and it is related to a stored cross-site scripting (XSS) vulnerability. The vulnerability allows a malformed Content-Type to bypass the fileUpload.fileExtensions blocklist and be stored unchanged. On storage adapters that persist and serve the uploaded Content-Type, a browser may render a file whose body begins with HTML as HTML, executing embedded script in the application's origin against other users who open the file URL.

Official resources