CVE-2026-45491

.NET Tampering Vulnerability

Published Jun 9, 2026 CVSS 3.1 · 6.2 Medium EPSS < 1% KEV · Not listed
Description
Improper link resolution before file access ('link following') in .NET allows an unauthorized attacker to perform tampering locally.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-7q4v-2mr6-5gpx Microsoft Security Advisory CVE-2026-45491 – .NET Tampering Vulnerability
Ubuntu USN Ubuntu USN USN-8420-1 .NET vulnerabilities
History
Type Values Removed Values Added
First Time appeared Redhat
Redhat enterprise Linux
Redhat hummingbird
CPEs cpe:/a:redhat:enterprise_linux:8
cpe:/a:redhat:hummingbird:1
cpe:/o:redhat:enterprise_linux:10.2
Vendors & Products Redhat
Redhat enterprise Linux
Redhat hummingbird
References
Metrics threat_severity

None

threat_severity

Moderate

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Improper link resolution before file access ('link following') in .NET allows an unauthorized attacker to perform tampering locally.
Title .NET Tampering Vulnerability
First Time appeared Microsoft
Microsoft .net
Weaknesses CWE-59
CPEs cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft .net
References
Metrics cvssV3_1

{'score': 6.2, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
microsoft
Published
Updated
Nov 10, 2026, 11:23 PM
Reserved
May 12, 2026, 4:07 PM
Status
Analyzed
Published
Jun 9, 2026, 5:17 PM
Modified
Nov 11, 2026, 12:18 AM
Severity
Moderate
Public date
Jun 9, 2026, 5:04 PM