CVE-2026-70087

Analyzed Analyzed - Analysis Complete

Incorrect Authorization Bypass in DNS Server

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description

Incorrect authorization in DNS Server allows an authorized attacker to bypass a security feature locally.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-13

Last Modified

2026-10-16

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-70087

EUVD

EUVD-2026-99154

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_server_2016	to 10.0.14393.9612 (exc)
microsoft	windows_server_2019	to 10.0.17763.9376 (exc)
microsoft	windows_server_2025	to 10.0.26100.33650 (exc)
microsoft	windows_server_2022	to 10.0.20348.5761 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-863	The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

Attack-Flow Graph

Executive Summary

This vulnerability involves incorrect authorization in the DNS Server component. An authorized attacker can exploit this to bypass a security feature locally on affected systems.

Detection Guidance

Detection requires checking DNS server configurations and logs for unauthorized access attempts. Monitor for unusual DNS query patterns or failed authorization events. Review Windows Event Logs for DNS Server errors or warnings related to authorization failures.

Impact Analysis

An attacker with local access could bypass security controls, potentially gaining unauthorized privileges or accessing restricted resources on the system.

Compliance Impact

This vulnerability allows an authorized attacker to bypass a security feature locally, which could undermine access controls and data protection measures required by standards like GDPR and HIPAA. Non-compliance risks include unauthorized data access or exposure, potentially leading to regulatory penalties.

Mitigation Strategies

Apply the latest security updates from Microsoft to address the incorrect authorization in the DNS Server. Monitor Microsoft's update guide for patches and install them promptly.

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