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CVE-2023-42346

Severity7.5 High CVSS 3.1
Fixed in16.0
WeaknessXML external entity (XXE) (CWE-611)
Published8 May 2026
Updated28 Oct 2026

Description

Alkacon OpenCms before 16 allows XXE when the <!DOCTYPE> refers to an external host.

Exploitation status

Proof of concept only

A proof of concept exists, but no reviewed exploit catalogue lists this CVE.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: poc CISA recorded that an exploit has been demonstrated. Automatable: yes, technical impact: partial.
  • Indexed PoC none indexed
  • EPSS 0.23% chance in 30 days

Waratek protection

Protected by Waratek

Waratek has a rule that blocks attacks on this vulnerability.

  • Protection full XXE
  • Action available security rule
  • Review automated Inferred
  • Record active
Decided by A vulnerability class already blocked by an ARMR security rule
Finding Protected by Waratek's ARMR xxe security rule, which blocks this class of attack at the JVM level without a rule written for this CVE specifically. The CVE's weakness is CWE-611: XML External Entity Reference.

How to mitigate CVE-2023-42346

Upgrade the affected software to 16.0 or later. Until you can, Waratek RASP blocks exploitation with its XXE rule. It runs inside the Java application, with no code changes.

Waratek RASP Runtime protection for Java applications

Affected software and releases

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.opencms:opencms-core 0 16.0 unbounded

Products and versions

1 product, 1 version entry
SourceVendorProductSchemeAffected versions
osv org.opencms opencms-core generic < 16.0

References

URLTags
https://github.com/alkacon/opencms-core PACKAGE
https://labs.watchtowr.com/xxe-you-can-depend-on-me-opencms WEB
https://labs.watchtowr.com/xxe-you-can-depend-on-me-opencms/

Timeline

Published2026-05-08By the CVE Program.
NVD record modified2026-10-28NVD's own last-modified date for this record.