CVE-2023-6379: Cross-site Scripting in Alkacon Software OpenCms

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-12-13 · updated 2026-06-17
Weakness: CWE-79

Description

Cross-site scripting (XSS) vulnerability in Alkacon Software Open CMS, affecting versions 14 and 15 of the 'Mercury' template. This vulnerability could allow a remote attacker to send a specially crafted JavaScript payload to a victim and partially take control of their browsing session.

Affected products

Alkacon OpenCms: from 14.0.0 before 16.0.0 — fixed in 16.0.0

How to fix

Upgrade to a fixed version: Alkacon OpenCms 16.0.0. Check the vendor advisory for mitigations.

References

https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-alkacon-software-opencms
https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-alkacon-software-opencms

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