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CVE-2026-58598— Windows Backup Service Elevation of Privilege Vulnerability

Quick assessment

Affected
Microsoft Windows 10 Version 21H2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft Windows Backup Engine是美国Microsoft公司的Windows操作系统中的内置核心组件，主要负责执行和管理系统状态、用户文件及应用程序数据的备份与还原恢复等任务。 Microsoft Windows Backup Engine存在安全漏洞，该漏洞源于共享资源并发执行时同步不当（竞争条件），可能导致授权攻击者本地提升权限。

CVSS 7.0 · High EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 5

VendorProduct Version RangeStatus
Microsoft Windows 10 Version 21H2 10.0.19044.0< 10.0.19044.7548 affected
Microsoft Windows 10 Version 22H2 10.0.19045.0< 10.0.19045.7548 affected
Microsoft Windows 11 Version 24H2 10.0.26100.0< 10.0.26100.8875 affected
Microsoft Windows 11 Version 25H2 10.0.26200.0< 10.0.26200.8875 affected
Microsoft Windows 11 version 26H1 10.0.28000.0< 10.0.28000.2525 affected
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I. Basic Information for CVE-2026-58598

Vulnerability Information
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Vulnerability Title
Windows Backup Service Elevation of Privilege Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Backup Engine allows an authorized attacker to elevate privileges locally.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Windows Backup Engine 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Windows Backup Engine是美国Microsoft公司的Windows操作系统中的内置核心组件，主要负责执行和管理系统状态、用户文件及应用程序数据的备份与还原恢复等任务。 Microsoft Windows Backup Engine存在安全漏洞，该漏洞源于共享资源并发执行时同步不当（竞争条件），可能导致授权攻击者本地提升权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Windows 10 Version 21H2 10.0.19044.0 ~ 10.0.19044.7548 -
Microsoft Windows 10 Version 22H2 10.0.19045.0 ~ 10.0.19045.7548 -
Microsoft Windows 11 Version 24H2 10.0.26100.0 ~ 10.0.26100.8875 -
Microsoft Windows 11 Version 25H2 10.0.26200.0 ~ 10.0.26200.8875 -
Microsoft Windows 11 version 26H1 10.0.28000.0 ~ 10.0.28000.2525 -

II. Public POCs for CVE-2026-58598

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III. Intelligence Information for CVE-2026-58598

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Vendor Advisories for CVE-2026-58598 (1)

Same Patch Batch · Microsoft · 2026-07-16 · 20 CVEs total

CVE-2026-59866 9.3 CRITICAL Kiota: Arbitrary file write + code-injection via x-ms-kiota-info clientClassName and clien
CVE-2026-59864 9.3 CRITICAL Kiota: Path/URL injection into generated Copilot plugin manifest via x-ai-* extensions
CVE-2026-59865 9.3 CRITICAL Kiota: Command injection via x-ms-kiota-info dependencyInstallCommand surfaced by `kiota i
CVE-2026-59860 8.7 HIGH Kiota: XML Doc-Comment Newline Breakout Code Injection
CVE-2026-59859 8.7 HIGH Kiota: Code Generation Literal Injection in the PHP Generator
CVE-2026-57206 8.6 HIGH SimpleChat plugin validation endpoints missing authentication and authorization
CVE-2026-59117 7.5 HIGH Windows Terminal Remote Code Execution Vulnerability
CVE-2026-59861 7.5 HIGH Kiota: Code Generation Literal Injection in Kiota Ruby Generator
CVE-2026-59862 7.5 HIGH Kiota: Code Generation Literal Injection in the Python Generator
CVE-2026-53598 7.5 HIGH Prompty: Arbitrary File Read via ${file:path} Reference Expansion
CVE-2026-59867 7.1 HIGH Kiota: Generation-time SSRF + remote/local file inclusion via unrestricted $ref
CVE-2026-59863 7.0 HIGH Kiota: Workspace-config poisoning: out-of-repo file write + generation-time SSRF
CVE-2026-55440 6.5 MEDIUM Microsoft UFO: COMMAND_RESULTS handler creates unowned sessions, allowing authenticated se
CVE-2026-58643 6.1 MEDIUM Windows Admin Center Spoofing Vulnerability
CVE-2026-62826 4.6 MEDIUM Microsoft SharePoint Server Spoofing Vulnerability
CVE-2026-57205 4.3 MEDIUM SimpleChat: Authenticated users can access other users' profile metadata through user IDOR
CVE-2026-54568 4.3 MEDIUM Microsoft UFO: Missing Authorization in DEVICE_INFO_REQUEST Allows a DEVICE Client to Read
CVE-2026-54733 moodle-local_o365: Authentication bypass via unverified JWT signature in Teams SSO endpoin
CVE-2026-53597 Prompty: Arbitrary code execution via JavaScript frontmatter in TypeScript loader

IV. Related Vulnerabilities

Same product: Windows 10 Version 21H2
Same vendor: Microsoft
Same weakness: CWE-362

V. Comments for CVE-2026-58598

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