What is CVE-2026-30880?

CVE-2026-30880 is a critical-severity vulnerability in Basercms, classified under OS Command Injection. CVSS score: 9.8/10. Published 2026-03-31.

How severe is CVE-2026-30880?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in Basercms

CVE-2026-30880

baserCMS is a website development framework. Prior to version 5.2.3, baserCMS has an OS command injection vulnerability in the installer. This issue has been patched in version 5.2.3.

Vulnerability class: Command Injection (OS Command Injection)

Published 2026-03-31 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.022 (82.2th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 82.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.020 · newest: 0.022 · change: +0.002

Affected products

Basercms
Baserproject Basercms — versions < 5.2.3

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

github.com/baserproject/basercms/security/advisories/GHSA-6hpg-8rx3-cwgv (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-2026-30880?: CVE-2026-30880 is a critical-severity vulnerability in Basercms, classified under OS Command Injection. CVSS score: 9.8/10. Published 2026-03-31.
How severe is CVE-2026-30880?: Critical severity. CVSS v3 base score is 9.8 out of 10.