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dnsdist

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.

CVE-2026-0397 is a security vulnerability identified in PowerDNS DNSdist versions 1.9.0 and 2.0.0 related to the internal webserver component. When this internal webserver is enabled—a setting disabled by default—the Cross-Origin Resource Sharing (CORS) policy is misconfigured, allowing an overly permissive cross-domain whitelist. This misconfiguration enables an attacker to craft a malicious website that, when visited by an administrator logged into the DNSdist dashboard, can extract sensitive information about the running configuration. The vulnerability does not permit modification of data or disruption of service but compromises confidentiality by leaking configuration details. Exploitation requires no privileges but does require user interaction (the administrator must visit the malicious site). The CVSS 3.1 base score is 3.1, indicating a low severity due to the limited impact and attack complexity. No known exploits are currently in the wild. The root cause is a failure to properly restrict CORS origins, which is critical in web applications to prevent unauthorized cross-origin requests. Since the internal webserver is disabled by default, exposure is limited to environments where administrators have explicitly enabled it. This vulnerability highlights the importance of secure default configurations and careful CORS policy management in administrative interfaces.

Detailed information about CVE-2026-0397: Overly Permissive Cross-domain Whitelist in PowerDNS DNSdist affecting PowerDNS DNSdist. Get real-time updates, techni

CVE-2026-0397: Overly Permissive Cross-domain Whitelist in PowerDNS DNSdist - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-0397: Overly Permissive Cross-domain Whitelist in PowerDNS DNSdist

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