CVE-2026-21861

Name: CVE-2026-21861
Creator: NVD / NIST
Published: 2026-03-31T01:16:35.54+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.2/10EPSS 2.28%

Last modified Jun 17, 2026

CVE-2026-21861 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. baserCMS is a website development framework. Prior to version 5.2.3, baserCMS contains an OS command injection vulnerability in the core update functionality. EPSS estimates a 2.28% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.2/10

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

EPSS Probability

2.28%

81.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Basercms	Basercms	< 5.2.3

References

https://basercms.net/security/JVN_20837860Vendor Advisory
https://github.com/baserproject/basercms/releases/tag/5.2.3Release Notes
https://github.com/baserproject/basercms/security/advisories/GHSA-qxmc-6f24-g86gExploit, Vendor Advisory
https://github.com/baserproject/basercms/security/advisories/GHSA-qxmc-6f24-g86gExploit, Vendor Advisory

Timeline

Published: Mar 31, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-21861?

How severe is CVE-2026-21861?

CVE-2026-21861 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 2.28% probability of exploitation in the next 30 days.

How do I fix CVE-2026-21861?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-21861?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST