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Vulnerability record · CVE-2026-21861 · published 31 March 2026

CVE-2026-21861: Basercms os command injection vulnerability

Basercms · Basercms

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.

7.2 CVSS 3.1 High EPSS 2.3% · top 17.5% CWE-78 · OS command injection
7.2CVSS 3.1 base score
2.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://basercms.net/security/JVN_20837860 Vendor Advisory
https://github.com/baserproject/basercms/releases/tag/5.2.3 Release Notes
https://github.com/baserproject/basercms/security/advisories/GHSA-qxmc-6f24-g86g ExploitVendor Advisory
https://github.com/baserproject/basercms/security/advisories/GHSA-qxmc-6f24-g86g ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-21861), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.