What is CVE-2026-30877?

CVE-2026-30877 is a critical-severity vulnerability in Baserproject 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.

RCE in Baserproject 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…

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.001 (19.9th percentile) — read the EPSS interpretation.

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.

Affected products

Baserproject Basercms — versions < 5.2.3

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

https://github.com/baserproject/basercms/security/advisories/GHSA-m9g7-rgfc-jcm7 (x_refsource_CONFIRM)
https://basercms.net/security/JVN_20837860 (x_refsource_MISC)
https://github.com/baserproject/basercms/releases/tag/5.2.3 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-30877?: CVE-2026-30877 is a critical-severity vulnerability in Baserproject 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.