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Not in CISA KEV
HIGH severity

CVE-2023-42344 — opencms-core

HIGH

CVE-2023-42344 is a high-severity (CVSS 7.3) XML External Entity (XXE) vulnerability in org.opencms:opencms-core. A fix is available for org.opencms:opencms-core — see the affected versions and patch details below.

Alkacon OpenCms allows remote unauthenticated attackers to obtain sensitive information

Also known asGHSA-rcc6-6q2f-m2cw
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

  • CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
  • CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.

Exploitation and automatability from CISA’s SSVC triage for CVE-2023-42344.

EPSS Exploitation Probability

via FIRST.org ↗
2.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs84th percentile — riskier than 84% of all scored CVEsHighest risk
0.00%4.40%8.80%13.2%10.7%2.3%Jun 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
☕org.opencms:opencms-core

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

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.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.opencms:opencms-coreall versions10.5.1org.opencms:opencms-core:10.5.1

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.opencms:opencms-core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.opencms:opencms-core to 10.5.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-42344 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How to detect CVE-2023-42344

A community-maintained Nuclei template exists for this CVE. You can scan for it directly:

nuclei -id cve-2023-42344 -u https://target
Template
OpenCMS - XML external entity (XXE)
Severity
high
Impact
Unauthenticated attackers can exploit XXE vulnerabilities to execute malicious requests on the OpenCMS server, potentially reading sensitive server files and internal data.
Remediation
Advised to upgrade to OpenCMS 10.5.1 or later to patch the vulnerability

Template by ProjectDiscovery nuclei-templates (0xr2r), MIT licensed. View the full template. Scan only systems you are authorised to test.

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

Is CVE-2023-42344 in your dependencies?

Find it across Maven, including transitive dependencies.

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CVE-2023-42344: opencms-core — Fixed in 10.5.1