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

> Attackers can bypass field access controls to read hidden or restricted data during document duplication in Payload CMS.

- **Severity:** Critical 9.3 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 6 Oct 2026
- **Updated:** 6 Oct 2026
- **Also known as:** GHSA-vc4h-q48j-5hcx

## What is CVE-2026-105851?

CVE-2026-105851 is a critical missing authorization vulnerability in payloadcms payload, published on 6 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-863 (Incorrect Authorization), CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2026-105851?

It affects 1 product.


Products: Payloadcms Payload.

## How do I fix CVE-2026-105851?

No fix has been published for CVE-2026-105851 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-105851 being exploited?

There is no known exploitation of CVE-2026-105851 in the wild and no public exploit code.

## Other vulnerabilities in payloadcms payload

- [CVE-2026-105857](https://insights.sbomify.com/CVE-2026-105857/): Payload: RCE in Payload Form Builder (critical 10.0)
- [CVE-2026-105859](https://insights.sbomify.com/CVE-2026-105859/): Payload: Unauthorized update to collection documents (critical 9.8)
- [CVE-2026-25544](https://insights.sbomify.com/CVE-2026-25544/): Payload has an SQL Injection in JSON/RichText Queries on PostgreSQL/SQLite Adapters (critical 9.8)
- [CVE-2022-27952](https://insights.sbomify.com/CVE-2022-27952/): Unrestricted Upload of File with Dangerous Type in Payload (critical 9.8)
- [CVE-2026-105863](https://insights.sbomify.com/CVE-2026-105863/): Payload authentication token field handling issue (critical 9.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-105851 and fix it if it is affected.

What it is: CVE-2026-105851 is a critical missing authorization vulnerability in payloadcms payload, published on 6 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-105851 in the wild and no public exploit code.

Affected product: payloadcms payload. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-105851/ (Markdown: https://insights.sbomify.com/CVE-2026-105851/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-105851
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-105851
- OSV: https://osv.dev/vulnerability/CVE-2026-105851

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-105851/
Summaries are generated and may contain mistakes; the official description above is the record.