What is CVE-2026-30879?

CVE-2026-30879 is a medium-severity vulnerability in Basercms, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-03-31.

How severe is CVE-2026-30879?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Basercms

CVE-2026-30879

baserCMS is a website development framework. Prior to version 5.2.3, baserCMS has a cross-site scripting vulnerability in blog posts. This issue has been patched in version 5.2.3.

Vulnerability class: XSS (Cross-Site Scripting)

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

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (23.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 23.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001

Affected products

Basercms
Baserproject Basercms — versions < 5.2.3

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/baserproject/basercms/security/advisories/GHSA-jmq3-x8q7-j9qm (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-2026-30879?: CVE-2026-30879 is a medium-severity vulnerability in Basercms, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-03-31.
How severe is CVE-2026-30879?: Medium severity. CVSS v3 base score is 6.1 out of 10.