Is CVE-2026-38429 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-38429 being exploited in the wild.

How severe is CVE-2026-38429?

Critical severity, with a CVSS score of 9.8, published 5 May 2026.

Which products and versions are affected?

Alkacon Software OpenCMS v20 and earlier.

Is there a fix for CVE-2026-38429?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-38429 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-38429?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-38429: Alkacon OpenCMS XXE in Admin Import DB feature

CVE-2026-38429 · Severity: critical · CVSS 9.8 · Published 2026-05-05

OpenCMS, a popular open-source content management system, contains a critical security flaw in its database import tool. An attacker can exploit this by uploading a specially crafted ZIP file, allowing them to potentially steal sensitive files from the server or disrupt operations. This could lead to a full compromise of the website's data and underlying infrastructure.

Quick answers

Is CVE-2026-38429 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-38429 being exploited in the wild.
How severe is CVE-2026-38429?: Critical severity, with a CVSS score of 9.8, published 5 May 2026.
Which products and versions are affected?: Alkacon Software OpenCMS v20 and earlier.
Is there a fix for CVE-2026-38429?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-38429 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-38429?: Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

OpenCMS v20 and prior versions are vulnerable to an XML External Entity (XXE) injection (CWE-611) within the Admin Import DB functionality. The vulnerability exists because the application's XML parser does not securely handle external entity references when processing the 'manifest.xml' file contained within a user-uploaded .zip archive. A remote, unauthenticated attacker can exploit this by submitting a malicious ZIP file to the import interface. Successful exploitation can lead to arbitrary file disclosure (OOB-XXE), server-side request forgery (SSRF), or denial-of-service. A patch has been identified in the alkacon/opencms-core repository (commit e3e41e5).

Affected products

Alkacon Software OpenCMS v20 and earlier

Timeline

2026-05-05: disclosed
2026-05-05: advisory: NVD publication date

References

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

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