---
title: "CVE-2026-105844: Payload: Prototype pollution in Payload Import Export plugin"
url: https://erroneo.us/security/cve/CVE-2026-105844/
description: "CVE-2026-105844 (@payloadcms/plugin-import-export (npm)): Payload is a free and open source headless content management system. In versions from 3.0.0…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-10-06
date_modified: 2026-10-09
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-105844"
kev: false
cvss: 9.3
epss: 0.00519
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.5% , percentile 43: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 43% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes @payloadcms/plugin-import-export (npm) >= 3.0.0, < 3.88.0, fixed in 3.88.0 ; @payloadcms/plugin-import-export (npm) >= 4.0.0-canary.0, < 4.0.0-canary.27, fixed in 4.0.0-canary.27 . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- npm `@payloadcms/plugin-import-export` >= 3.0.0, < 3.88.0 → fixed: 3.88.0
- npm `@payloadcms/plugin-import-export` >= 4.0.0-canary.0, < 4.0.0-canary.27 → fixed: 4.0.0-canary.27

## Affected products (CVE record)

- payloadcms payload: >= 3.0.0, < 3.88.0, >= 4.0.0-canary.0, < 4.0.0-canary.27
- @payloadcms plugin-import-export: >= 3.0.0, < 3.88.0, >= 4.0.0-canary.0, < 4.0.0-canary.27

## Severity

- GitHub_M CVSS 4.0: 9.3 `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`
- GitHub CVSS 4.0: 9.3 `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`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.52% probability of exploitation activity in the next 30 days; percentile 43.

## Sources

- [GitHub Advisory GHSA-qf28-8hc6-vwrp](https://github.com/advisories/GHSA-qf28-8hc6-vwrp)
- [CVE.org record CVE-2026-105844](https://www.cve.org/CVERecord?id=CVE-2026-105844)
- [NVD entry CVE-2026-105844](https://nvd.nist.gov/vuln/detail/CVE-2026-105844)
- [github.com](https://github.com/payloadcms/payload/security/advisories/GHSA-qf28-8hc6-vwrp)
- [github.com](https://github.com/payloadcms/payload/commit/a742140ab4fca3160f7f83e9e7d996552ffc3b5a)
- [github.com](https://github.com/payloadcms/payload/releases/tag/v3.88.0)

---
Source page: https://erroneo.us/security/cve/CVE-2026-105844/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt