CVE-2026-114155: .NET Elevation of Privilege Vulnerability
CVE-2026-114155 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. Microsoft released the fix on 10 November 2026 in the November 2026 Patch Tuesday, delivered through 1 security update (KB5135241). It affects 6 products in 1 product family (Developer Tools).
Key facts
- CVE ID
- CVE-2026-114155
- Severity
- High CVSS 7.5
- Microsoft severity
- Important
- Impact
- Elevation of Privilege
- Exploited in the wild
- No
- Publicly disclosed
- No
- Weakness
- CWE-367
- CISA KEV
- Not listed
- Released
- Last updated
- Patch Tuesday
- November 2026 Patch Tuesday
- Product families
- Developer Tools
CVSS score and vector
Microsoft scores CVE-2026-114155 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
Time-of-check time-of-use (toctou) race condition in .NET allows an authorized attacker to elevate privileges locally.
Frequently asked questions (Microsoft)
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.
What privileges could an attacker gain by successfully exploiting this vulnerability?
An attacker could execute code with the permissions of another user on the affected system. This could give the attacker access to data and resources available to that user.
Affected products (6)
Developer Tools
| Product | Security update | Type | Fixed build | Restart |
|---|---|---|---|---|
| Microsoft.DotNet.HotReload.Watch.Aspire on Linux | Release Notes | Security Update | 11.0.100 | |
| Microsoft.DotNet.HotReload.Watch.Aspire on Mac OS | Release Notes | Security Update | 11.0.100 | |
| .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 Linux | Release Notes | Security Update | 11.0.100 | |
| .NET 11.0 installed on Mac OS | Release Notes | Security Update | 11.0.100 |
Security updates (1)
- KB5135241 (Security Update)
NIST NVD data
- NVD status
- Awaiting Analysis
- NVD CVSS
- 7.5 (HIGH)
- NVD weakness
- CWE-367
- 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. |