CVE-2026-53724

CVE-2026-53724 · Parse Server: Stored XSS via trailing-dot filename bypassing file upload extension blocklist

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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 2.1 · Faible · EPSS 0,3% · Correctif disponible

Publication

2026-06-12T18:34:38.237Z

Mise à jour

2026-06-12T20:01:13.569Z

Pile logicielle: node

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