.NET Elevation of Privilege Vulnerability

published 2026-09-08 2 mo ago modified 2026-10-31 8 d ago also EUVD-2026-73721

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits: 0; none known

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

Patch / fix

fixed in 2 links 1

Microsoft Microsoft Visual Studio 2022 version 17.14 17.14.40
Microsoft Microsoft Visual Studio 2026 version 18.9 18.9.3

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

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-69805 updated 2026-10-30 cvss 7.5

dotnet: .NET: Elevation of Privilege via external control of file name or path

Red Hat Hardened Images dotnet8.0, dotnet9.0, dotnet10.0
not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 2 mo ago (2026-09-09)

Exploit prediction

0.50% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.5	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
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	3.1	8.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Microsoft Microsoft Visual Studio 2022 version 17.14
Microsoft Microsoft Visual Studio 2026 version 18.9
Microsoft Microsoft.Diagnostics.Runtime

Classification

Weakness

CWE-73 External Control of File Name or Path
CWE-522 Insufficiently Protected Credentials
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

msrc.microsoft.com /update-guide/vulnerability/CVE-2026-69805
vendor-advisory, patch

Sources

CVE List CVE-2026-69805
NVD CVE-2026-69805

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary