Is CVE-2026-126537 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-126537 being exploited in the wild.

How severe is CVE-2026-126537?

Critical severity, with a CVSS score of 9.1, published 11 November 2026.

Which products and versions are affected?

Ninja Forms File Uploads up to 3.3.36.

Is there a fix for CVE-2026-126537?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-126537 attacked?

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

Am I affected by CVE-2026-126537?

Check whether you run Ninja Forms File Uploads 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-2026-126537: Ninja Forms File Uploads arbitrary file deletion

CVE-2026-126537 · Severity: critical · CVSS 9.1 · Published 2026-11-11

The File Uploads add-on for the Ninja Forms WordPress plugin allows unauthenticated attackers to delete arbitrary files from the affected website's server. An attacker can exploit this by crafting a malicious form submission that bypasses file path validation, potentially deleting critical files such as wp-config.php, which would force WordPress into setup mode and enable complete site takeover and data theft.

Vendors: Ninja Forms.

Quick answers

Is CVE-2026-126537 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-126537 being exploited in the wild.
How severe is CVE-2026-126537?: Critical severity, with a CVSS score of 9.1, published 11 November 2026.
Which products and versions are affected?: Ninja Forms File Uploads up to 3.3.36.
Is there a fix for CVE-2026-126537?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-126537 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-126537?: Check whether you run Ninja Forms File Uploads 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.

Technical details

The vulnerability exists in the upload.php and backgroundupload.php components, where missing upload_id parameter validation and lack of path canonicalization allow client-supplied file paths to reach the unlink() call without directory containment checks. An unauthenticated attacker can omit the upload_id field and supply an arbitrary data[file_path] during form submission, which is processed by the background upload queue without proper validation against the upload directory restrictions that are only enforced for administrative paths.

Affected products

Ninja Forms File Uploads up to 3.3.36

Timeline

2026-11-11: disclosed

References

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