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CVE-2026-30879: baserCMS: Cross-site scripting vulnerability in blog post

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-31 · updated 2026-06-17
• Weakness: CWE-79

Description

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.

Affected products

• baserproject basercms: before 5.2.3 — fixed in 5.2.3

How to fix

Upgrade to a fixed version: baserproject basercms 5.2.3. Check the vendor advisory for mitigations.

References

• https://basercms.net/security/JVN_20837860
• https://github.com/baserproject/basercms/releases/tag/5.2.3
• https://github.com/baserproject/basercms/security/advisories/GHSA-jmq3-x8q7-j9qm

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