CVE-2023-6379

Cross-site Scripting in Alkacon Software OpenCms

5.4 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

1.75%Up 1.7 points since Dec 14, 2023

What each source reports

CVE List Score used 5.4

Cross-site Scripting in Alkacon Software OpenCms

Record: CVE-2023-6379
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

EUVDEUVD-2023-58619 5.4

Record: EUVD-2023-58619
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Updated: 2026-11-03

GitHub AdvisoriesGHSA-w62v-q77r-66cc 5.4

Alkacon OpenCMS XSS via Mercury template

Record: GHSA-w62v-q77r-66cc
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

NVD 5.4

Record: CVE-2023-6379
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

OSV 5.4

Cross-site Scripting in Alkacon Software OpenCms

Record: CVE-2023-6379
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

OSVGHSA-w62v-q77r-66cc 5.4

Alkacon OpenCMS XSS via Mercury template

Record: GHSA-w62v-q77r-66cc
CVSS 3.1: 5.4 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`org.opencms:opencms-core` Maven	14.0.0 up to 16.0.0	16.0.0
`org.opencms:opencms-core` Maven	14.0.0 up to 16.0.0, plus listed versions 14.015.0	16.0.0

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
Nuclei	OpenCMS 14 & 15 - Cross Site Scripting

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, published	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, Nuclei, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2023-6379 is a medium vulnerability (CVSS 5.4) in Alkacon Open Cms, published December 13, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.75%, the 78th percentile. Fixed in org.opencms:opencms-core 16.0.0.