---
id: CVE-2020-24036
title: >-
  PHP object injection in the Ajax endpoint of the backend in ForkCMS below
  version 5.8.3 allows an authenticated remote user to execute malicious code.
summary: >-
  PHP object injection in the Ajax endpoint of the backend in ForkCMS below
  version 5.8.3 allows an authenticated remote user to execute malicious code.
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-502
vendor: fork-cms
product: fork_cms
affected:
  - fork_cms < 5.8.3
patched:
  - fork_cms 5.8.3
published: '2021-03-04'
updated: '2026-07-05'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-24036'
references:
  - url: >-
      http://packetstormsecurity.com/files/161764/ForkCMS-PHP-Object-Injection.html
    label: cve@mitre.org
  - url: 'http://seclists.org/fulldisclosure/2021/Mar/31'
    label: cve@mitre.org
  - url: >-
      https://tech.feedyourhead.at/content/ForkCMS-PHP-Object-Injection-CVE-2020-24036
    label: cve@mitre.org
  - url: >-
      https://www.ait.ac.at/themen/cyber-security/pentesting/security-advisories/ait-sa-20210215-04
    label: cve@mitre.org
  - url: 'http://forkcms.com'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://seclists.org/fulldisclosure/2021/Mar/31'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://tech.feedyourhead.at/content/ForkCMS-PHP-Object-Injection-CVE-2020-24036
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://www.ait.ac.at/themen/cyber-security/pentesting/security-advisories/ait-sa-20210215-04
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.0296
epssPercentile: 0.86673
ingestedAt: '2026-07-05T00:59:25.825Z'
---

## Overview

PHP object injection in the Ajax endpoint of the backend in ForkCMS below version 5.8.3 allows an authenticated remote user to execute malicious code.

## Affected

- `fork_cms < 5.8.3`

## Remediation

Upgrade past the affected range:

- `fork_cms 5.8.3`