RCE in Basercms
CVE-2026-30877
baserCMS is a website development framework. Prior to version 5.2.3, there is an OS command injection vulnerability in the update functionality. Due to this issue, an authenticated user with administrator privileges in baserCMS can execute arbitrary OS commands on the server with the privileges of the user account running baserCMS. This issue has been patched in version 5.2.3.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.021 (80.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 80.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.015 · newest: 0.021 · change: +0.005
Affected products
- Basercms
- Baserproject Basercms — versions < 5.2.3
Weakness classification (CWE)
References
- github.com/baserproject/basercms/security/advisories/GHSA-m9g7-rgfc-jcm7 (Vendor Advisory)
- basercms.net/security/JVN_20837860 (Vendor Advisory)
- github.com/baserproject/basercms/releases/tag/5.2.3 (Release Notes)
Frequently asked questions
- What is CVE-2026-30877?
- CVE-2026-30877 is a critical-severity vulnerability in Basercms, classified under OS Command Injection. CVSS score: 9.1/10. Published 2026-03-31.
- How severe is CVE-2026-30877?
- Critical severity. CVSS v3 base score is 9.1 out of 10.