WaratekVRT Sign in

CVE-2023-42344

Severity7.3 High CVSS 3.1
Fixed in10.5.1
WeaknessXML external entity (XXE) (CWE-611)
Published8 May 2026
Updated28 Oct 2026

Description

Alkacon OpenCms before 10.5.1 allows remote unauthenticated attackers to obtain sensitive information via a cmis-online/query XXE attack on a Chemistry servlet.

Exploitation status

Exploited

Real-world exploitation reported by VulnCheck KEV. CISA has not confirmed it.

  • CISA KEV not listed
  • VulnCheck KEV listed Exploitation reported in the wild. Honeypot sightings · earliest 2024-04-02.
  • CISA Vulnrichment exploitation: poc CISA recorded that an exploit has been demonstrated. Automatable: yes, technical impact: partial.
  • Indexed PoC 1 indexed Published artifacts you can open, in Nuclei.
  • EPSS 2.3% chance in 30 days

VulnCheck KEV

Exploitation evidence from VulnCheck Known Exploited Vulnerabilities (VulnCheck KEV), used under VulnCheck's community terms. View CVE-2023-42344 in VulnCheck (free account).

EvidenceSourceDetailDate
Honeypot sighting Shadowserver honeypots Exploitation attempts seen on 413 days 2024-04-02 to 2026-11-04
Honeypot sighting VulnCheck canaries Exploitation attempts seen on 8 days 2026-10-22 to 2026-11-05
IndexArtifactStarsFirst seen
Nuclei OpenCMS - XML external entity (XXE)

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-2023-42344

Upgrade the affected software to 10.5.1 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 10.5.1 unbounded

Products and versions

1 product, 1 version entry
SourceVendorProductSchemeAffected versions
osv org.opencms opencms-core generic < 10.5.1

References

URLTags
https://github.com/projectdiscovery/nuclei-templates/issues/8864 WEB
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

VulnCheck KEV: earliest evidence2024-04-02Date of the oldest evidence of exploitation in VulnCheck KEV's record. VulnCheck does not publish the date it listed the CVE.
Published2026-05-08By the CVE Program.
NVD record modified2026-10-28NVD's own last-modified date for this record.
VulnCheck KEV: latest evidence2026-11-05Date of the newest report, exploit reference or honeypot sighting in VulnCheck KEV's record.