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CVE-2023-6379 Alkacon OpenCms

Affected softwareAlkacon OpenCms
Severity6.1 Medium CVSS 3.1 2 scores
Fixed in16.0.0
WeaknessCross-site scripting (CWE-79)
Published13 Dec 2023
Updated17 Jun 2026

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.

Exploitation status

Working exploit published

A reviewed exploit catalogue lists ready-to-run exploit code for this CVE.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC 1 indexed Published artifacts you can open, in Nuclei.
  • EPSS 1.8% chance in 30 days
IndexArtifactStarsFirst seen
Nuclei OpenCMS 14 & 15 - Cross Site Scripting

Waratek protection

Mitigation candidate

A kind of vulnerability Waratek's rules address, with exploit code published or exploitation reported. No rule exists and none is planned yet. The decision below says what we found to build a rule from.

  • Protection none
  • Action unverified
  • Review automated Inferred
  • Record active
Decided by The affected package being open source on Maven, so the fix can be read
Finding This CVE affects an open-source Java library published on Maven Central (Maven packages: org.opencms:opencms-core), so it is squarely in ARMR's territory and the source needed to understand the defect is public. That makes it a candidate for an ARMR patch rule. No rule exists and none is scheduled: the diff between the affected and fixed versions has not been read, and a closer look may find no hook point ARMR can act on.

CVSS

6.1 MEDIUM v3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 6.1 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N NVD Primary published
CVSS 3.1 5.4 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N cve-coordination@incibe.es Secondary

Affected software and releases

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.opencms:opencms-core 14.0.0 16.0.0 unbounded

Products and versions

2 products, 2 version entries
SourceVendorProductSchemeAffected versions
nvd alkacon opencms generic ≥ 14.0.0 and < 16.0.0
osv org.opencms opencms-core generic ≥ 14.0.0 and < 16.0.0

References

URLTags
https://github.com/alkacon/opencms-core/commit/d965c18ac6d24ad75bfea272edb8b2efd4290afa WEB
https://github.com/alkacon/opencms-core WEB
https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-alkacon-software-opencms WEB

Timeline

Published2023-12-13By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.