CVE-2026-105544: .NET Elevation of Privilege Vulnerability
CVE-2026-105544 is an elevation of privilege vulnerability in .NET, rated Important by Microsoft, with a CVSS 3.1 base score of 7.5 (High). An attacker can exploit it by an attacker with local access, with low privileges and only if a user takes an action. Microsoft has not reported exploitation in the wild and rates exploitation as less likely. Microsoft released the fix on 10 November 2026 in the November 2026 Patch Tuesday, delivered through 3 security updates (KB5135243, KB5135242, KB5135241). It affects 16 products in 2 product families (Developer Tools, Other).
Key facts
- CVE ID
- CVE-2026-105544
- Severity
- High CVSS 7.5
- Microsoft severity
- Important
- Impact
- Elevation of Privilege
- Exploited in the wild
- No
- Publicly disclosed
- No
- Exploitation likelihood
- Less Likely
- Weakness
- CWE-15
- CISA KEV
- Not listed
- Released
- Last updated
- Patch Tuesday
- November 2026 Patch Tuesday
- Product families
- Developer Tools, Other
CVSS score and vector
Microsoft scores CVE-2026-105544 at 7.5 (temporal 6.5) using CVSS 3.1. Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C
| Metric | Value |
|---|---|
| Attack vector | Local |
| Attack complexity | High |
| Privileges required | Low |
| User interaction | Required |
| Scope | Changed |
| Confidentiality impact | High |
| Integrity impact | High |
| Availability impact | High |
| Exploit code maturity | Unproven |
| Remediation level | Official fix |
| Report confidence | Confirmed |
Description
Improper access control in .NET allows an authorized attacker to elevate privileges locally.
Frequently asked questions (Microsoft)
What privileges could be gained by an attacker who successfully exploited the vulnerability?
The attacker would gain the rights of the user that is running the affected application.
According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
Successful exploitation of this vulnerability requires an attacker to win a race condition.
Affected products (16)
Developer Tools
| Product | Security update | Type | Fixed build | Restart |
|---|---|---|---|---|
| .NET 8.0 installed on Windows | KB5135243 | Security Update | 8.0.428 | |
| .NET 8.0 installed on Linux | KB5135243 | Security Update | 8.0.428 | |
| .NET 8.0 installed on Mac OS | KB5135243 | Security Update | 8.0.428 | |
| .NET 9.0 installed on Windows | KB5135242 | Security Update | 9.0.321 | |
| .NET 9.0 installed on Linux | KB5135242 | Security Update | 9.0.321 | |
| .NET 9.0 installed on Mac OS | KB5135242 | Security Update | 9.0.321 | |
| .NET 10.0 installed on Windows | KB5135241 | Security Update | 10.0.404 | |
| .NET 10.0 installed on Linux | KB5135241 | Security Update | 10.0.404 | |
| .NET 10.0 installed on Mac OS | KB5135241 | Security Update | 10.0.404 | |
| .NET 11.0 installed on Windows | Release Notes | Security Update | 11.0.100 | |
| .NET 11.0 installed on Linux | Release Notes | Security Update | 11.0.100 | |
| .NET 11.0 installed on Mac OS | Release Notes | Security Update | 11.0.100 | |
| Microsoft Visual Studio 2022 version 17.14 | Release Notes | Security Update | 17.14.45 | |
| Microsoft Visual Studio 2026 version 18.11 | ||||
| Microsoft Visual Studio 2026 version 18.12 |
Other
| Product | Security update | Type | Fixed build | Restart |
|---|---|---|---|---|
| Microsoft.TestPlatform.CLI | Release Notes | Security Update | 18.11.1 |
Security updates (3)
NIST NVD data
- NVD status
- Awaiting Analysis
- NVD CVSS
- 7.5 (HIGH)
- NVD weakness
- CWE-15
- Published to NVD
- NVD last modified
References
Acknowledgments
Revision history
| Version | Date | Description |
|---|---|---|
| 1.0 | Information published. | |
| 2.0 | Changes made to the security updates links and information. This is an informational change only. |