How severe is CVE-2023-42345?

CVE-2023-42345 has a CVSS score of 6.1/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2023-42345?

CVE-2023-42345 affects the following packages: org.opencms:opencms-core (Maven). Ecosystems affected: Maven.

How do I fix CVE-2023-42345?

Update org.opencms:opencms-core to 16.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-42345 is resolved across your whole dependency graph.

How do I detect CVE-2023-42345 in my Maven dependencies?

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.

How do I mitigate CVE-2023-42345 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is CVE-2023-42345 actively exploited in the wild?

No public exploit code has been indexed for CVE-2023-42345 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2023-42345?

CVE-2023-42345 has an EPSS (Exploit Prediction Scoring System) score of 0.1%, placing it in the 4th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2023-42345?

CVE-2023-42345 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2023-42345 published, and has it been updated?

CVE-2023-42345 was published on May 8, 2026 and was last updated on May 14, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕

☕ Maven

Not in CISA KEV

MEDIUM severity

CVE-2023-42345 — opencms-core

MEDIUM

CVE-2023-42345 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) 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 is vulnerable to XSS via updateModelGroups.jsp

Published

May 8, 2026

Updated

May 14, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2023-42345.

EPSS Exploitation Probability

via FIRST.org ↗

0.1%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs4th percentile — riskier than 4% of all scored CVEsHighest risk

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

A Cross Site Scripting vulnerability in Alkacon OpenCms before 16 exists via updateModelGroups.jsp.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.opencms:opencms-core`	all versions	16.0`org.opencms:opencms-core:16.0`

Detection & mitigation playbook

Open-source dependency

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.
Fix
Update org.opencms:opencms-core to 16.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-42345 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

A Cross Site Scripting vulnerability in Alkacon OpenCms before 16 exists via updateModelGroups.jsp.

O3 Security · Impact-Aware SCA

Is CVE-2023-42345 in your dependencies?

Find it across Maven, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

6.1/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CWE Classification

CWE-79Cross-site Scripting (XSS)

Weaponization

No Nuclei template, Metasploit module or public proof-of-concept found.

OpenSSF Scorecard

Package health score

opencms-core

2.5/10

Code-Review0/10

Maintained10/10

Branch-Protection0/10

Assessed Nov 2, 2026

Timeline

Disclosed

May 8, 2026

Last updated

May 14, 2026

Identifiers

CVE-2023-42345

References

Advisorynvd.nist.gov · CVE 2023 42345 Weblabs.watchtowr.com · xxe you can depend on me opencms Packagegithub.com · opencms core

Related vulnerabilities

This CVE is medium severity; 7 of 8 other CVEs affecting opencms-core are rated as high or higher (top: high).

CVE-2023-42343CVE-2023-42346CVE-2023-42344CVE-2024-41446CVE-2024-42699CVE-2024-41447CVE-2024-5520CVE-2023-6379

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedMay 14, 2026