Microsoft Security Advisory CVE-2026-62886: .NET Elevation of Privilege Vulnerability
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评估
- 难度
- 4/5
- 预计耗时
- 1-3 小时
- 新手友好度
- 8/100
- Issue 类型
- 文档
- 描述清晰度
- 需要澄清
- 活跃度
- 冷清
- 领域
- security
调研方向
This is a published security advisory bulletin, not a change request, and the body does not say what to edit. The leftover TBD placeholders are in the Summary, Mitigation factors, Acknowledgments and Revisions sections, and the affected-version table is the only concrete data. Before any work, confirm with maintainers whether the placeholders should be filled or the issue closed, since the PowerShell and WPF discussion is directed to other threads.
由索引模型根据 Issue 内容生成。
描述
Microsoft Security Advisory CVE-2026-62886: .NET Elevation of Privilege Vulnerability
Executive Summary
Microsoft is releasing this security advisory to provide information about a vulnerability in Windows Presentation Foundation. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.
An integer overflow or wraparound in .NET allows an unauthorized attacker to elevate privileges locally.
System administrators are advised to update PowerShell 7 to an unaffected version (see affected software).
Discussion
Please open a support question to discuss the PowerShell aspects of this advisory.
Please use https://github.com/dotnet/wpf/issues/11826 for discussion of the .NET WPF aspects of this advisory.
Affected Software
The vulnerability affects PowerShell 7 prior to the following versions:
| PowerShell 7 Version | Affected version | Patched Version |
|---|---|---|
| 7.6 | <7.6.5 | 7.6.5 |
| 7.5 | <7.5.10 | 7.5.10 |
| 7.4 | <7.4.19 | 7.4.19 |
The vulnerability affects PowerShell when running on the following operating systems:
| Operating System | Affected |
|---|---|
| Windows | Yes |
| macOS | No |
| Linux | No |
Advisory FAQ
How do I know if I am affected?
If all of the following are true:
- Run
pwsh -v, then, check the version in the table in Affected Software to see if your version of PowerShell 7 is affected.
How do I update to an unaffected version?
Follow the instructions at Installing PowerShell 7 to install the latest version of PowerShell 7.
Updating PowerShell 7 using Microsoft Update
Updating PowerShell 7 using Microsoft Update
Other Information
Reporting Security Issues
If you have found a potential security issue in PowerShell 7,
please email details to [email protected].
Support
You can ask questions about this issue on GitHub in the PowerShell organization.
This is located at https://github.com/PowerShell/.
The Announcements repo (https://github.com/PowerShell/Announcements)
will contain this bulletin as an issue and will include a link to a discussion issue where you can ask questions.
Disclaimer
The information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
What if the update breaks my script or module?
You can uninstall the newer version of PowerShell 7 and install the previous version of PowerShell 7.
This should be treated as a temporary measure.
Therefore, the script or module should be updated to work with the patched version of PowerShell 7.
Acknowledgments
zpbrent; kai63001; 41ae55e9310ff27fa6f26af4727e5590; Ky0toFu
Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure.
See acknowledgments for more information.
External Links
CVE-2026-62886
Revisions
V1.0 (August 17, 2026): Advisory published.
Version 1.0
Last Updated 2026-08-17
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