# CVE-2026-105851: Payload CMS field access control bypass in duplicate operation

Source: https://junglewise.ai/threats/cve-2026-105851-payload-field-access-control-bypass-on-auth-collections  
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-2026-105851 · Severity: critical · Published 2026-10-06

Payload CMS is a content management system that manages documents and enforces field-level access controls. A flaw in the document duplication feature allows users to copy sensitive fields they should not have access to read or create, bypassing built-in security restrictions even when duplication is supposedly disabled.

Technologies: [Payload CMS Payload](https://junglewise.ai/threats/technologies/payload-cms-payload). Vendors: [Payload CMS](https://junglewise.ai/threats/vendors/payload-cms).

## Quick answers

**Is CVE-2026-105851 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-105851 being exploited in the wild.

**How severe is CVE-2026-105851?** Critical severity, published 6 October 2026.

**Which products and versions are affected?** Payload CMS Payload >3.0.0, <3.90.0 and >4.0.0-canary.0, <4.0.0-canary.34.

**Is there a fix for CVE-2026-105851?** Yes: fixed in 3.90.0, 4.0.0-canary.34. Until then: Add a beforeDuplicate field hook to restricted fields and set the value to empty or a default value until upgrading. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-105851 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-105851?** Check whether you run Payload CMS Payload 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

- Fixed in 3.90.0, 4.0.0-canary.34

Add a beforeDuplicate field hook to restricted fields and set the value to empty or a default value until upgrading.

## Technical details

The duplicate operation in Payload copies field values from source documents without respecting access.read or access.create rules or field visibility settings. An unauthenticated or low-privilege attacker can exploit this via a network request to duplicate a document and retrieve restricted field contents. The disableDuplicate setting on auth collections does not prevent this bypass.

## Affected products

- Payload CMS Payload >3.0.0, <3.90.0 and >4.0.0-canary.0, <4.0.0-canary.34

## Identifiers

- CVE-2026-105851
- GHSA-vc4h-q48j-5hcx

## Timeline

- 2026-09-18: disclosed: Published to GitHub Advisory Database
- 2026-10-06: advisory: Updated advisory

## References

- [https://api.github.com/users/Zerotistic](https://api.github.com/users/Zerotistic)

## Related threats

- [Payload CMS stored XSS in XML upload handling](https://junglewise.ai/threats/cve-2026-105868-payload-is-a-free-and-open-source-headless-content-management)
- [Payload CMS path traversal in file deletion](https://junglewise.ai/threats/cve-2026-105865-payload-is-a-free-and-open-source-headless-content-management)
- [Payload CMS authentication token tampering via reserved JWT fields](https://junglewise.ai/threats/cve-2026-105863-payload-is-a-free-and-open-source-headless-content-management)
- [Payload CMS stored XSS in SVG upload sanitization](https://junglewise.ai/threats/cve-2026-105862-payload-is-a-free-and-open-source-headless-content-management)
- [Payload CMS credential exposure via unvalidated external URL redirect](https://junglewise.ai/threats/cve-2026-105861-payload-is-a-free-and-open-source-headless-content-management)