CVE-2026-0397
Received Received - Intake
CORS Misconfiguration in Open-Xchange Webserver Enables Data Exposure

Publication date: 2026-03-31

Last updated on: 2026-04-14

Assigner: Open-Xchange

Description
When the internal webserver is enabled (default is disabled), an attacker might be able to trick an administrator logged to the dashboard into visiting a malicious website and extract information about the running configuration from the dashboard. The root cause of the issue is a misconfiguration of the Cross-Origin Resource Sharing (CORS) policy.
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Meta Information
Published
2026-03-31
Last Modified
2026-04-14
Generated
2026-06-16
AI Q&A
2026-03-31
EPSS Evaluated
2026-06-14
NVD
CVE-2026-0397
EUVD
EUVD-2026-17363
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
powerdns dnsdist From 1.9.0 (inc) to 1.9.12 (exc)
powerdns dnsdist From 2.0.0 (inc) to 2.0.3 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-942 The product uses a web-client protection mechanism such as a Content Security Policy (CSP) or cross-domain policy file, but the policy includes untrusted domains with which the web client is allowed to communicate.
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Executive Summary

This vulnerability occurs when the internal webserver is enabled (which is disabled by default). An attacker can trick an administrator who is logged into the dashboard into visiting a malicious website. Due to a misconfiguration in the Cross-Origin Resource Sharing (CORS) policy, the attacker can then extract information about the running configuration from the dashboard.

Impact Analysis

The vulnerability can lead to unauthorized disclosure of configuration information from the dashboard if an administrator is tricked into visiting a malicious website. This could potentially expose sensitive configuration details to attackers, although the impact is limited to information disclosure with a low severity score.

Mitigation Strategies

To mitigate this vulnerability, ensure that the internal webserver is disabled if not needed, as it is disabled by default.

Additionally, review and correct the Cross-Origin Resource Sharing (CORS) policy configuration to prevent unauthorized information extraction from the dashboard.

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