by Kastro
Paper/Archive/CVE-2026-21861

CVE-2026-21861

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

EPSS 2%public exploitCVSS 9.1
critical.is priorityof 100
54
CVSS 9.1 (CNA)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 83.5.835 × 2016.7Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
basercms< 5.2.3–CNA

Scores by source

GitHub_M (CNA)9.1CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

exploitgithub.com/baserproject/basercms/security/advisories/GHSA-qxmc-6f24-g86grefbasercms.net/security/JVN_20837860refgithub.com/baserproject/basercms/releases/tag/5.2.3