---
id: CVE-2026-78834
title: A code execution vulnerability exists in CMSimple 5.22 in the CoAuthors plugin
summary: >-
  A code execution vulnerability exists in CMSimple 5.22 in the CoAuthors
  plugin. An authenticated low-privileged user who can modify page content and
  provide controlled imported content can trigger server-side execution by
  referencing cra…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-94
published: '2026-09-08'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T16:04:24.933'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-78834'
references:
  - url: 'https://gist.github.com/AEQ3/574cb644306776a9ff1a0de30b085e62'
    label: cve@mitre.org
  - url: 'https://github.com/AEQ3/CVE/issues/1'
    label: cve@mitre.org
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-09T13:05:22.526332Z'
ingestedAt: '2026-09-08T21:11:12.320Z'
epss: 0.00666
epssPercentile: 0.49724
---

## Overview

A code execution vulnerability exists in CMSimple 5.22 in the CoAuthors plugin. An authenticated low-privileged user who can modify page content and provide controlled imported content can trigger server-side execution by referencing crafted external or uploaded text content through the affected content import feature.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.