CVE-2026-50360

Analyzed Analyzed - Analysis Complete

Incorrect Authentication Algorithm in Windows SMB Server Allows Privilege Escalation

Publication date: 2026-07-14

Last updated on: 2026-07-23

Assigner: Microsoft Corporation

Description

Incorrect implementation of authentication algorithm in Windows SMB Server allows an authorized attacker to elevate privileges over a network.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-07-14

Last Modified

2026-07-23

Generated

2026-08-04

AI Q&A

2026-07-15

EPSS Evaluated

2026-08-02

NVD

CVE-2026-50360

EUVD

EUVD-2026-43858

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_11_26h1	to 10.0.28000.2269 (exc)
microsoft	windows_server_2022	to 10.0.20348.5386 (exc)
microsoft	windows_server_2025	to 10.0.26100.33158 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2525 (exc)
microsoft	windows_11_24h2	to 10.0.26100.8875 (exc)
microsoft	windows_11_24h2	to 10.0.26100.8875 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7548 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7548 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7548 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7548 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7548 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7548 (exc)
microsoft	windows_11_25h2	to 10.0.26200.8875 (exc)
microsoft	windows_11_25h2	to 10.0.26200.8875 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-303	The requirements for the product dictate the use of an established authentication algorithm, but the implementation of the algorithm is incorrect.

Attack-Flow Graph

Executive Summary

This vulnerability is an incorrect implementation of the authentication algorithm in the Windows SMB Server. It allows an authorized attacker to elevate their privileges over a network.

Impact Analysis

An attacker could exploit this to gain higher privileges on a system running the vulnerable SMB Server, potentially leading to unauthorized access or control.

Compliance Impact

This vulnerability could lead to unauthorized access, which may violate data protection requirements under GDPR or HIPAA, depending on the affected system and data.

Mitigation Strategies

Apply the latest security updates from Microsoft for Windows SMB Server to correct the authentication algorithm implementation. Monitor Microsoft's security advisories for patches and install them promptly.

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