CVE-2026-21861 CRITICAL

CVE-2026-21861: baserCMS: OS Command Injection Leading to Remote Code Execution (RCE)

Vendor Baserproject
Product basercms
Weakness CWE-78
Published March 31, 2026
Last update March 31, 2026
View on NVD All CVEs

CVSS base score

9.1/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

What the vulnerability does

01Description

baserCMS is a website development framework. Prior to version 5.2.3, baserCMS contains an OS command injection vulnerability in the core update functionality. An authenticated administrator can execute arbitrary OS commands on the server due to improper handling of user-controlled input that is directly passed to exec() without sufficient validation or escaping. This issue has been patched in version 5.2.3.

Key dates

02Disclosure timeline

March 31, 2026 CVE published
March 31, 2026 Record updated