What is CVE-2023-42346?

Alkacon OpenCms before 16 allows XXE when the refers to an external host.

How severe is CVE-2023-42346?

CVE-2023-42346 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2023-42346 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2023-42346?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2023-42346 have an EU (EUVD) identifier?

Yes. CVE-2023-42346 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-46799.

When was CVE-2023-42346 published?

CVE-2023-42346 was published on 2026-05-08 and last updated on 2026-06-17.

CVE-2023-42346

CVE-2023-42346 is a high-severity vulnerability with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-611.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-46799
Weakness: CWE-611
Published: 2026-05-08
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2023-42346?: Alkacon OpenCms before 16 allows XXE when the <!DOCTYPE> refers to an external host.
How severe is CVE-2023-42346?: CVE-2023-42346 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2023-42346 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2023-42346?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2023-42346 have an EU (EUVD) identifier?: Yes. CVE-2023-42346 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-46799.
When was CVE-2023-42346 published?: CVE-2023-42346 was published on 2026-05-08 and last updated on 2026-06-17.

References

https://labs.watchtowr.com/xxe-you-can-depend-on-me-opencms/

Other CWE-611 (Improper Restriction of XML External Entity Reference (XXE)) vulnerabilities

CVE-2022-22486 — Critical (CVSS 10.0): IBM Tivoli Workload Scheduler 9.4, 9.5, and 10.1 is vulnerable to an XML External Entity Injection (XXE) attack when…
CVE-2019-14678 — Critical (CVSS 10.0): SAS XML Mapper 9.45 has an XML External Entity (XXE) vulnerability that can be leveraged by malicious attackers in…
CVE-2015-9280 — Critical (CVSS 10.0): MailEnable before 8.60 allows XXE via an XML document in the request.aspx Options parameter.
CVE-2018-1000838 — Critical (CVSS 10.0): autopsy version <= 4.9.0 contains a XML External Entity (XXE) vulnerability in CaseMetadata XML Parser that can result…
CVE-2018-1000837 — Critical (CVSS 10.0): UML Designer version <= 8.0.0 contains a XML External Entity (XXE) vulnerability in XML parser for plugins that can…
CVE-2018-1000835 — Critical (CVSS 10.0): KeePassDX version <= 2.5.0.0beta17 contains a XML External Entity (XXE) vulnerability in kdbx file parser that can…

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