# CVE-2026-5718: File upload in Drag and Drop Multiple File Upload for Contact Form 7

> Unauthenticated attackers can upload arbitrary files to achieve remote code execution by bypassing filename sanitization in this WordPress plugin.

- **Severity:** High 8.1 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Apr 2026
- **Updated:** 27 May 2026
- **Also known as:** GHSA-xj7v-jqv6-v48w

## What is CVE-2026-5718?

CVE-2026-5718 is a high-severity vulnerability in glenwpcoder Drag and Drop Multiple File Upload for Contact Form 7, published on 17 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Drag and Drop Multiple File Upload for Contact Form 7 plugin for WordPress is vulnerable to arbitrary file upload in versions up to, and including, 1.3.9.7. This is due to insufficient file type validation that occurs when custom blacklist types are configured, which replaces the default dangerous extension denylist instead of merging with it, and the wpcf7_antiscript_file_name() sanitization function being bypassed for filenames containing non-ASCII characters. This makes it possible for unauthenticated attackers to upload arbitrary files, such as PHP files, to the server, which can be leveraged to achieve remote code execution. The vulnerability was originally reported by Leonid Semenenko (lsemenenko) and partially patched in version 1.3.9.7. A bypass for the patch was separately discovered and reported by Nguyen Hung (Mitchell).

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2026-5718?


## How do I fix CVE-2026-5718?

No fix has been published for CVE-2026-5718 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-5718 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5718 exists.

Public exploit code:

- https://github.com/kyukazamiqq/cve-2026-5718 (github_poc): https://github.com/kyukazamiqq/cve-2026-5718
- https://github.com/rootdirective-sec/CVE-2026-5718-Lab (github_poc): https://github.com/rootdirective-sec/CVE-2026-5718-Lab
- CVE-2026-5718: Unauthenticated File Upload To RCE in DnD Upload CF7 Plugin (github_poc): https://github.com/xxconi/CVE-2026-5718
- WORDPRESS (github_poc): https://github.com/xxconi/CVE-2026-5718-PR-V-EXPLO-T
- Drag and Drop Multiple File Upload - CF7 <= 1.3.9.6 - Remote Code Execution (nuclei): http/cves/2026/CVE-2026-5718.yaml

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-5718 and fix it if it is affected.

What it is: CVE-2026-5718 is a high-severity vulnerability in glenwpcoder Drag and Drop Multiple File Upload for Contact Form 7, published on 17 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5718 exists.

Affected product: glenwpcoder Drag and Drop Multiple File Upload for Contact Form 7. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-5718/ (Markdown: https://insights.sbomify.com/CVE-2026-5718/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-5718
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-5718
- OSV: https://osv.dev/vulnerability/CVE-2026-5718

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-5718/
Summaries are generated and may contain mistakes; the official description above is the record.