# CVE-2026-105857: Payload plugin-form-builder remote code execution

Source: https://junglewise.ai/threats/cve-2026-105857-payload-is-a-free-and-open-source-headless-content-management  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-06. Updated: 2026-10-06  
License: CC BY 4.0 with a link back

CVE-2026-105857 · Severity: critical · CVSS 10 · Published 2026-10-06

Payload is a headless content management system that stores and serves website and application content. The Form Builder plugin allows attackers to craft malicious form submissions that execute arbitrary code on the server, giving them complete control over the system and access to all stored data. An attacker can exploit this remotely without authentication.

Vendors: [npm](https://junglewise.ai/threats/vendors/npm), [Payload](https://junglewise.ai/threats/vendors/payload).

## Quick answers

**Is CVE-2026-105857 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-105857 being exploited in the wild.

**How severe is CVE-2026-105857?** Critical severity, with a CVSS score of 10, published 6 October 2026.

**Which products and versions are affected?** @payloadcms/plugin-form-builder (npm) SEMVER:introduced=0,fixed=3.90.0; Payload Plugin-Form-Builder before 3.90.0 and canary versions before 4.0.0-canary.34.

**Is there a fix for CVE-2026-105857?** Yes. @payloadcms/plugin-form-builder (npm): upgrade to 3.90.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-105857 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-105857?** Check whether you run @payloadcms/plugin-form-builder (npm) or Payload Plugin-Form-Builder at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- @payloadcms/plugin-form-builder (npm): upgrade to 3.90.0 or later

  ```sh
  npm install @payloadcms/plugin-form-builder@3.90.0
  ```


## Technical details

A code execution vulnerability exists in the form data handling logic of the plugin-form-builder, allowing remote unauthenticated attackers to inject and execute arbitrary code via crafted form submissions. The vulnerability is in how form submission data is processed server-side without sufficient sanitization. This is fixed in versions 3.90.0 and 4.0.0-canary.34.

## Affected products

- Payload plugin-form-builder before 3.90.0 and canary versions before 4.0.0-canary.34

## Identifiers

- CVE-2026-105857
- GHSA-r488-j9vj-wx3q

## Timeline

- 2026-10-06: disclosed
- 2026-09-18: patched

## References

- [https://github.com/payloadcms/payload/commit/333b82b9f3e685fed6826c2e3270da79df8336c6](https://github.com/payloadcms/payload/commit/333b82b9f3e685fed6826c2e3270da79df8336c6)
- [https://github.com/payloadcms/payload/releases/tag/v3.90.0](https://github.com/payloadcms/payload/releases/tag/v3.90.0)