CVE-2026-53724

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.79 and 9.9.1-alpha.4, the default file upload extension blocklist can be bypassed by appending a trailing dot to a filename whose extension would otherwise be blocked (e.g. poc.svg.). The trailing dot causes the extension parser to extract an empty string, which short-circuits the blocklist check, and the attacker-controlled Content-Type is forwarded to the storage adapter unchanged. Storage adapters that persist and serve the provided Content-Type (such as S3 or GCS) then serve the file with an active type such as image/svg+xml, enabling stored XSS when a victim opens the file URL. The default GridFS adapter is not affected because it sets X-Content-Type-Options: nosniff on responses. This issue has been patched in versions 8.6.79 and 9.9.1-alpha.4.

CVSS

No CVSS.

References

Link	Resource
https://github.com/parse-community/parse-server/pull/10489
https://github.com/parse-community/parse-server/pull/10490
https://github.com/parse-community/parse-server/security/advisories/GHSA-7wqv-xjf3-x35v

Configurations

No configuration.

History

12 Jun 2026, 19:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-12 19:16

Updated : 2026-06-12 19:16

NVD link : CVE-2026-53724

Mitre link : CVE-2026-53724

CVE.ORG link : CVE-2026-53724

JSON object : View

Products Affected

No product.

CWE

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CWE-434

Unrestricted Upload of File with Dangerous Type

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