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CVE-2026-21861

baserCMS: OS Command Injection Leading to Remote Code Execution (RCE)

Published: Mar 31, 2026Updated: Apr 1, 2026 Sources: CVE List NVDCWE-78
NVD MITRE
9.1CVSSCRITICAL
EPSS Score
2.3%
Top 19.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:HUI:NS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-78

Affected Products

basercmsbasercms
On-premWeb App
Web & CMS Plugins / cms-core
basercmsbaserproject
On-prem
Web & CMS Plugins / cms-core
basercmscommercialWeb & CMS Plugins
baserprojectoss-projectWeb & CMS Pluginsaka basercms

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Execution
View detailed technique mapping

References

https://basercms.net/security/JVN_20837860
basercms.net
https://github.com/baserproject/basercms/releases/tag/5.2.3
github.com
https://github.com/baserproject/basercms/security/advisories/GHSA-qxmc-6f24-g86g
github.com

Timeline

Published
Mar 31, 2026
Last Updated
Apr 1, 2026

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