CVE-2026-45491 - Vulnerability Details - OpenCVE

Improper link resolution before file access ('link following') in .NET allows an unauthorized attacker to perform tampering locally.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Vendors	Products
Microsoft	.net

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors	Products

References

Link	Providers
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45491

History

Tue, 09 Jun 2026 17:15:00 +0000

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		https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45491
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'}`

MITRE

Status: PUBLISHED

Assigner: microsoft

Published: 2026-06-09T17:04:44.457Z

Updated: 2026-06-09T17:48:27.809Z

Reserved: 2026-05-12T16:07:22.618Z

Link: CVE-2026-45491

Vulnrichment

No data.

NVD

Status : Awaiting Analysis

Published: 2026-06-09T17:17:25.567

Modified: 2026-06-09T19:32:51.440

Link: CVE-2026-45491

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-06-09T19:15:12Z

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-45491", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "state": "PUBLISHED", "assignerShortName": "microsoft", "dateReserved": "2026-05-12T16:07:22.618Z", "datePublished": "2026-06-09T17:04:44.457Z", "dateUpdated": "2026-06-09T17:48:27.809Z"}, "containers": {"cna": {"title": ".NET Tampering Vulnerability", "datePublic": "2026-06-09T14:00:00.000Z", "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "versionStartIncluding": "10.0.0", "versionEndExcluding": "10.0.9"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "versionStartIncluding": "8.0", "versionEndExcluding": "8.0.28"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "versionStartIncluding": "8.0.0", "versionEndExcluding": "8.0.28"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "versionStartIncluding": "9.0.0", "versionEndExcluding": "9.0.17"}]}]}], "affected": [{"vendor": "Microsoft", "product": ".NET 10.0", "versions": [{"version": "10.0.0", "lessThan": "10.0.9", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": ".NET 8.0", "versions": [{"version": "8.0", "lessThan": "8.0.28", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": ".NET 8.0", "versions": [{"version": "8.0.0", "lessThan": "8.0.28", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": ".NET 9.0", "versions": [{"version": "9.0.0", "lessThan": "9.0.17", "versionType": "custom", "status": "affected"}]}], "descriptions": [{"value": "Improper link resolution before file access ('link following') in .NET allows an unauthorized attacker to perform tampering locally.", "lang": "en-US"}], "problemTypes": [{"descriptions": [{"description": "CWE-59: Improper Link Resolution Before File Access ('Link Following')", "lang": "en-US", "type": "CWE", "cweId": "CWE-59"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-06-09T17:48:27.809Z"}, "references": [{"name": ".NET Tampering Vulnerability", "tags": ["vendor-advisory", "patch"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45491"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en-US", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "baseSeverity": "MEDIUM", "baseScore": 6.2, "vectorString": "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"}}]}}}