.NET Tampering Vulnerability

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-45491
StatePUBLISHED
Assignermicrosoft
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-09 17:17:25 UTC
Updated2026-06-17 22:39:35 UTC
DescriptionImproper link resolution before file access ('link following') in .NET allows an unauthorized attacker to perform tampering locally.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

EPSS: 0.003010000 probability, percentile 0.215470000 (date 2026-06-16)

Problem Types: CWE-59 | CWE-59 CWE-59: Improper Link Resolution Before File Access ('Link Following')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
3.1[email protected]Secondary6.2MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
3.1CNACVSS6.2MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Microsoft .net All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Microsoft .NET 10.0 affected 10.0.0 10.0.9 custom Not specified
CNA Microsoft .NET 8.0 affected 8.0 8.0.28 custom Not specified
CNA Microsoft .NET 8.0 affected 8.0.0 8.0.28 custom Not specified
CNA Microsoft .NET 9.0 affected 9.0.0 9.0.17 custom Not specified

References

ReferenceSourceLinkTags
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45491 [email protected] msrc.microsoft.com Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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