Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.6.0-alpha.15 and 8.6.41, an attacker who is allowed to upload files can bypass the file extension filter by appending a MIME parameter (e.g. `;charset=utf-8`) to the `Content-Type` header. This causes the extension validation to fail matching against the blocklist, allowing active content to be stored and served under the application's domain. In addition, certain XML-based file extensions that can render scripts in web browsers are not included in the default blocklist. This can lead to stored XSS attacks, compromising session tokens, user credentials, or other sensitive data accessible via the browser's local storage. The fix in versions 9.6.0-alpha.15 and 8.6.41 strips MIME parameters from the `Content-Type` header before validating the file extension against the blocklist. The default blocklist has also been extended to include additional XML-based extensions (`xsd`, `rng`, `rdf`, `rdf+xml`, `owl`, `mathml`, `mathml+xml`) that can render active content in web browsers. Note that the `fileUpload.fileExtensions` option is intended to be configured as an allowlist of file extensions that are valid for a specific application, not as a denylist. The default denylist is provided only as a basic default that covers most common problematic extensions. It is not intended to be an exhaustive list of all potentially dangerous extensions. Developers should not rely on the default value, as new extensions that can render active content in browsers might emerge in the future. As a workaround, configure the `fileUpload.fileExtensions` option to use an allowlist of only the file extensions that your application needs, rather than relying on the default blocklist.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js.
    Prior to 9.6.0-alpha.15 and 8.6.41, an attacker who is allowed to upload files can bypass the file
    extension filter by appending a MIME parameter (e.g. `;charset=utf-8`) to the `Content-Type` header. This
    causes the extension validation to fail matching against the blocklist, allowing active content to be
    stored and served under the application's domain. In addition, certain XML-based file extensions that can
    render scripts in web browsers are not included in the default blocklist. This can lead to stored XSS
    attacks, compromising session tokens, user credentials, or other sensitive data accessible via the
    browser's local storage. The fix in versions 9.6.0-alpha.15 and 8.6.41 strips MIME parameters from the
    `Content-Type` header before validating the file extension against the blocklist. The default blocklist
    has also been extended to include additional XML-based extensions (`xsd`, `rng`, `rdf`, `rdf+xml`, `owl`,
    `mathml`, `mathml+xml`) that can render active content in web browsers. Note that the
    `fileUpload.fileExtensions` option is intended to be configured as an allowlist of file extensions that
    are valid for a specific application, not as a denylist. The default denylist is provided only as a basic
    default that covers most common problematic extensions. It is not intended to be an exhaustive list of all
    potentially dangerous extensions. Developers should not rely on the default value, as new extensions that
    can render active content in browsers might emerge in the future. As a workaround, configure the
    `fileUpload.fileExtensions` option to use an allowlist of only the file extensions that your application
    needs, rather than relying on the default blocklist. (CVE-2026-32728)

ID	Name	Product	Family	Type	Severity
438826	SCA: security update for parse-server (GHSA-42ph-pf9q-cr72)	Tenable Cloud Security	SCA Checks	Local	high
438826	SCA: security update for parse-server (GHSA-42ph-pf9q-cr72)	Tenable Self-Hosted Container Security	SCA Checks	Local	high

Detections

Analytics

CVE-2026-32728

high

Tenable Plugins

high

high