CVE-2026-0740 - The Ninja Forms - File Uploads plugin for WordPress is vulnerable to arbitrary file uploads due to missing fil

CVE-2026-0740 + The Ninja Forms - File Uploads plugin for WordPress is vulnerable to arbitrary file uploads due to missing fil + Critical + 2026-04-07

One-sentence business risk

Attackers can turn a normal application path into code execution, making this a direct production-host takeover risk.

Research notes

  • Root cause: The Ninja Forms - File Uploads plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the ‘NF_FU_AJAX_Controllers_Uploads::handle_upload’ function in all versions up to, and including, 3.3.26.
  • Affected versions: up to, and including, 3.
  • Fixed / safe versions: patched in version 3.3.25 and fully patched in version 3.3.27…
  • Public exploit / PoC signal: the consulted NVD/GHSA/vendor sources describe the trigger class; treat it as reproducible until patched.
  • CVSS: 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Exact vulnerable code pattern

save_upload(webroot + "/" + request.files["file"].filename)  # trusts extension/content-type and leaves scripts executable

Fixed / mitigated code pattern

sniff bytes, allow only expected media types, store outside webroot under a random name, and serve through a non-executable download handler

Dependency or runtime update:

composer show invoice-generator || true
composer require invoice-generator --with-all-dependencies
composer audit

Step-by-step integration guide

  1. Inventory invoice-generator across source, lockfiles, SBOMs, container images, CI images, and deployment manifests.
  2. Upgrade to patched in version 3.3.25 and fully patched in version 3.3.27. or apply the exact vendor patch referenced below.
  3. Replace the vulnerable unsafe-upload pattern with the fixed pattern and fail closed on malformed input.
  4. Add a regression test that exercises the advisory trigger and proves the request is rejected, bounded, or authorized.
  5. Deploy through canary, monitor security logs and resource metrics, then remove temporary edge blocks only after all runtimes are fixed.

Alternative mitigations

  • Disable the vulnerable feature path while the package/runtime update rolls out.
  • Add WAF or reverse-proxy rules for traversal tokens, prototype-polluting keys, oversized frames, shell metacharacters, or unauthenticated tool calls matching the trigger class.
  • Restrict internal egress, rotate exposed secrets, and revoke affected tokens/keys if the vulnerability can disclose config, logs, JWT secrets, proxy credentials, or PKI material.
  • For admin/API authorization issues, temporarily require elevated roles and explicit ownership checks at the gateway.

Detection signature

id: cve-2026-0740-the-ninja-forms-file-uploads-plugin-for-wordpres
source: "NVD/media cross-check"
dependency_or_product: "invoice-generator"
affected: "up to, and including, 3"
fixed: "patched in version 3.3.25 and fully patched in version 3.3.27."
signals:
  - "unsafe-upload"
  - "../"
  - "__proto__"
  - "tools/call"
  - "wp_ajax_nopriv"
  - "pickle.loads"
  - "shell command construction"
action: "upgrade, add regression test, and verify deploy artifact"

Copy-paste skill

You are remediating CVE-2026-0740 (The Ninja Forms - File Uploads plugin for WordPress is vulnerable to arbitrary file uploads due to missing fil) in this repository.

Find every affected dependency, runtime, image, service configuration, and reachable code path. Upgrade or patch to patched in version 3.3.25 and fully patched in version 3.3.27.. Replace the vulnerable unsafe-upload pattern with a fail-closed implementation, add a regression test for the trigger shape, and update deployment/SBOM artifacts. If this repository does not control the affected runtime, create TRIAGE.md naming the owner, affected version, fixed version, and blocking decision.

Keywords, affected tech stack, and revenue tags

  • Keywords: CVE-2026-0740, unsafe-upload, invoice-generator, NVD/media cross-check.
  • Affected tech stack: php/composer.
  • Revenue tags: sellable_to_fintech, enterprise_blocker, zero_day_gold.

References