CVE-2026-30879 — baserCMS has a cross-site scripting vulnerability in blog posts

Description

baserCMS has a cross-site scripting vulnerability in blog posts. ### Target baserCMS 5.2.1 and earlier versions ### Vulnerability Malicious Javascript may be executed in blog posts. ### Countermeasures Update to the latest version of baserCMS Please refer to the following page to reference for more information. https://basercms.net/security/JVN_20837860 ### Credits Gai Tanaka@Mitsui Bussan Secure Directions, Inc.

How to fix CVE-2026-30879

To remediate CVE-2026-30879, upgrade the affected package to a fixed version below.

—upgrade to 5.2.3 or later

Is CVE-2026-30879 being exploited?

Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.

Affected packages (1)

from 0, < 5.2.3

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 4.0	—	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

References (5)

ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-30879
PATCHgithub.com/baserproject/basercms
WEBbasercms.net/security/JVN_20837860
WEBgithub.com/baserproject/basercms/releases/tag/5.2.3
WEB