How severe is CVE-2026-38429?

CVE-2026-38429 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-38429 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-38429?

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

Does CVE-2026-38429 have an EU (EUVD) identifier?

Yes. CVE-2026-38429 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27401.

When was CVE-2026-38429 published?

CVE-2026-38429 was published on 2026-05-05 and last updated on 2026-06-17.

CVE-2026-38429

CVE-2026-38429 is a critical-severity vulnerability with a CVSS 3.x base score of 9.8. 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: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-27401
Weakness: CWE-611
Published: 2026-05-05
Last modified: 2026-06-17

Description

OpenCMS v20 and before is vulnerable to XML External Entity (XXE) in the Admin Import DB feature due to insecure XML parsing of user supplied .zip files containing a manifest.xml.

Frequently asked questions

What is CVE-2026-38429?: OpenCMS v20 and before is vulnerable to XML External Entity (XXE) in the Admin Import DB feature due to insecure XML parsing of user supplied .zip files containing a manifest.xml.
How severe is CVE-2026-38429?: CVE-2026-38429 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-38429 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-38429?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-38429 have an EU (EUVD) identifier?: Yes. CVE-2026-38429 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27401.
When was CVE-2026-38429 published?: CVE-2026-38429 was published on 2026-05-05 and last updated on 2026-06-17.

References

https://github.com/alkacon/opencms-core/commit/e3e41e5a96d71383279e7d23c627efc9934008c1

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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…
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