What is CVE-2023-6379?

CVE-2023-6379 is a medium-severity vulnerability in Alkacon Open Cms, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-12-13.

How severe is CVE-2023-6379?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Is CVE-2023-6379 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Alkacon Open Cms

CVE-2023-6379

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.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-12-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.018 (77.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Alkacon Open Cms — versions 14, 15
Alkacon Opencms

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-alkacon-sof… (Third Party Advisory)

Frequently asked questions

What is CVE-2023-6379?: CVE-2023-6379 is a medium-severity vulnerability in Alkacon Open Cms, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-12-13.
How severe is CVE-2023-6379?: Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2023-6379 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.