GHSA-p96c-xwx8-3cqj: Npm/@payloadcms/plugin-multi-tenant vulnerability

Published Oct 7, 2026
·
Updated

Impact

When using the default tenant array field access, an authenticated user could assign themselves to other tenants.

You are affected if:

- You are using @payloadcms/plugin-multi-tenant

If you configure the tenants arrayFieldAccess.create/update functions, a secured replacement membership field, you are not affected by this specific default behavior.

Patches

Users should upgrade Payload packages to >= 3.90.0 or >= 4.0.0-canary.34.

Workarounds

Configure tenants arrayFieldAccess.create and tenants arrayFieldAccess.update so only trusted users authorized for all tenants can modify memberships.

Affected Software

2 affected componentsFixes available
npm/@payloadcms/plugin-multi-tenant>=4.0.0-canary.0<4.0.0-canary.34
4.0.0-canary.34
npm/@payloadcms/plugin-multi-tenant<3.90.0
3.90.0

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade npm/@payloadcms/plugin-multi-tenant to a version that resolves this vulnerability.

    Fixed in 4.0.0-canary.34
  2. Upgrade

    Upgrade npm/@payloadcms/plugin-multi-tenant to a version that resolves this vulnerability.

    Fixed in 3.90.0
  3. Upgrade

    Upgrade @payloadcms/plugin-multi-tenant to a version that resolves this vulnerability.

    Fixed in 3.90.0
  4. Upgrade

    Upgrade @payloadcms/plugin-multi-tenant to a version that resolves this vulnerability.

    Fixed in 4.0.0-canary.34
  5. Configuration

    Configure tenants arrayFieldAccess.create and tenants arrayFieldAccess.update so only trusted users authorized for all tenants can modify memberships.

    @payloadcms/plugin-multi-tenant tenants arrayFieldAccess.create and tenants arrayFieldAccess.update = Only trusted users authorized for all tenants

Event History

Oct 7, 2026
Advisory Published
via GitHub·08:29 PM
Data Sourced
via GitHub·08:29 PM
DescriptionWeaknessAffected Software

Frequently Asked Questions

1

Who can exploit this issue?

An authenticated user can exploit the default tenant array field access behavior to assign themselves to other tenants. The issue applies to deployments using @payloadcms/plugin-multi-tenant.

2

Are customized tenant membership controls affected?

Not by this specific default behavior if tenants arrayFieldAccess.create and tenants arrayFieldAccess.update are configured, or if a secured replacement membership field is used.

3

What can be done before upgrading?

Configure tenants arrayFieldAccess.create and tenants arrayFieldAccess.update so that only trusted users authorized for all tenants can modify memberships.

4

Which versions contain the fix?

Upgrade Payload packages to version 3.90.0 or later, or 4.0.0-canary.34 or later.

Contact

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Fortitude Valley,
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info@secalerts.co
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