Is CVE-2026-53724 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-53724 being exploited in the wild.

How severe is CVE-2026-53724?

Medium severity, with a CVSS score of 4, published 12 June 2026.

Which products and versions are affected?

parse-server (npm) SEMVER:introduced=9.0.0,fixed=9.9.1-alpha.4.

Is there a fix for CVE-2026-53724?

Yes. parse-server (npm): upgrade to 9.9.1-alpha.4 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-53724 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-53724?

Check whether you run parse-server (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-53724: Parse Server stored XSS via trailing dot filename bypass

CVE-2026-53724 · Severity: medium · CVSS 4 · Published 2026-06-12

Parse Server, an open-source backend framework, contains a vulnerability in how it handles file uploads. An attacker can bypass security restrictions to upload malicious files (like SVG images containing scripts) by adding a dot to the end of a filename. If a user opens one of these files, the attacker could execute malicious code in the user's browser, potentially leading to unauthorized actions or data theft.

Technologies: parse-server (npm). Vendors: npm.

Quick answers

Is CVE-2026-53724 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-53724 being exploited in the wild.
How severe is CVE-2026-53724?: Medium severity, with a CVSS score of 4, published 12 June 2026.
Which products and versions are affected?: parse-server (npm) SEMVER:introduced=9.0.0,fixed=9.9.1-alpha.4.
Is there a fix for CVE-2026-53724?: Yes. parse-server (npm): upgrade to 9.9.1-alpha.4 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-53724 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-53724?: Check whether you run parse-server (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

parse-server (npm): upgrade to 9.9.1-alpha.4 or later
```
npm install parse-server@9.9.1-alpha.4
```

Technical details

A stored cross-site scripting (XSS) vulnerability exists in Parse Server's file upload handler. The default extension blocklist can be bypassed by appending a trailing dot to a filename (e.g., 'malicious.svg.'). This causes the extension parser to return an empty string, bypassing blocklist checks while preserving the attacker-supplied Content-Type. When stored in adapters like S3 or GCS that serve the original Content-Type, the file is delivered as an active type (e.g., image/svg+xml), executing scripts in the victim's browser. The vulnerability is patched in versions 9.9.1-alpha.4 and 8.6.79.

Affected products

Parse Community parse-server >= 9.0.0, < 9.9.1-alpha.4; <= 8.6.78

Identifiers

CVE-2026-53724
GHSA-7wqv-xjf3-x35v

Timeline

2026-06-12: advisory: NVD publication date
2026-06-19: disclosed: GitHub Advisory published

References

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