basercms.net
https://basercms.net/security/JVN_20837860 CVE-2026-21861
CRITICAL
baserCMS: OS Command Injection Leading to Remote Code Execution (RCE)
Record summary
CVE-2026-21861 has a selected CVSS score of 9.1 (critical).
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.
Description source: CVE List
Exploitation context
CISA SSVC decision
ExploitationPoC
AutomatableNo
Technical impactTotal
CISA Coordinator · SSVC 2.0.3 · Evaluated Mar 31, 2026 · Source: CVE List
Affected products and versions
2| Product | Source | Version range | Status |
|---|---|---|---|
basercmsBrowse baserproject / basercms | CVE List | < 5.2.3 | affected |
baserproject/basercmsBrowse Packagist / baserproject/basercms | GitHub Advisory | Before 5.2.3 · Fixed in 5.2.3 | affected |
References
5github.com
https://github.com/baserproject/basercms github.com
https://github.com/baserproject/basercms/releases/tag/5.2.3 github.comConfirmation
https://github.com/baserproject/basercms/security/advisories/GHSA-qxmc-6f24-g86g nvd.nist.gov
https://nvd.nist.gov/vuln/detail/CVE-2026-21861