Is CVE-2026-21861 actively exploited?

No active exploitation of CVE-2026-21861 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-21861 be exploited remotely?

Yes. CVE-2026-21861 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-21861?

CVE-2026-21861 has a CVSS score of 7.2 (HIGH).

HOME VULNERABILITIESCVE-2026-21861

HIGH

CVE-2026-21861

CWE-78Published: March 31, 2026· Updated: Apr 1, 2026

7.2

CVSS v3.1

EPSS:0.17%probability of exploitation in 30 daysPercentile:38.7th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-21861 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.2.