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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
9.1CRITICAL
NVD MITRE
EPSS Score
2.3%
Top 18.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not 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.

No summary for this CVE yet.

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
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Weaknesses

CWE-78

Affected Products

basercms
commercial
basercmsOn-premWeb App
Web & CMS Plugins / cms-core
baserproject
oss-projectaka basercms
basercmsOn-prem
Web & CMS Plugins / cms-core

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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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

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