CVE-2026-45491
.NET Tampering Vulnerability
No known exploitation. EPSS puts it in the 33rd percentile. Fixed versions are out.
No public exploit knownFix4 products3 fixed builds listed below
e.g. OID 1.3.6.1.4.1.25623.1.0.837690
What to do
Find your product and version, then upgrade to the build on the right.
- Microsoft .NET 10.0Affected: ≥ 10.0.0, < 10.0.9Upgrade to: 10.0.9Stated by: CVE record
- Microsoft .NET 8.0Affected: ≥ 8.0, < 8.0.28Upgrade to: 8.0.28Stated by: CVE record
- Microsoft .NET 9.0Affected: ≥ 9.0.0, < 9.0.17Upgrade to: 9.0.17Stated by: CVE record
- Microsoft .netAffected: ≥ 8.0.0, < 8.0.28Upgrade to: 8.0.28Stated by: NVD
Versions as the sources state them. Full version matrix after sign-in
What it is
From the CVE record
Improper link resolution before file access ('link following') in .NET allows an unauthorized attacker to perform tampering locally.
In plain language
No plain-language summary for this CVE yet.
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Not in the catalog. CISA has not confirmed exploitation.
- Public exploits
No public exploit or proof of concept found in the sources we track.
- EPSS
0.4% chance of exploitation activity in the next 30 days, which ranks it in the 33rd percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
Lifecycle
8 events over 44 days, from the signal feeds we watch.
- Patch availablerecord updated
- OpenVAS check added
- Patch availablerecord updated
- Publishedweakness classified, att&ck mapped
Affected products
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Scored 6.2 by NVD.
How it is reached
- Attack Vector LocalRequires local access to the vulnerable system (e.g. local login, malicious file)
- Attack Complexity LowNo special conditions — the attack can be reliably reproduced
- Privileges Required NoneNo authentication required — anyone can exploit this
- User Interaction NoneNo user interaction needed — fully automated exploitation
Scope
- Scope UnchangedImpact is limited to the vulnerable component itself
Impact if exploited
- Confidentiality NoneNo confidentiality impact
- Integrity HighTotal loss of integrity — attacker can modify any data in the component
- Availability NoneNo availability impact
Weaknesses
ATT&CK techniques
Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.
Sources
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