CVE-2026-45491Important
.NET Tampering Vulnerability
Assessment
Improper link resolution before file access ('link following') in .NET allows an unauthorized attacker to perform tampering locally.
- Severity
- Important
- CVSS base score
- 6.2CVSS:3.1/
AV:L/ AC:L/ PR:N/ UI:N/ S:U/ C:N/ I:H/ A:N/ E:U/ RL:O/ RC:C - Impact
- Tampering
- EPSS, next 30 days
- 0.4%Higher than 28.6% of scored CVEs · FIRST model run 29 Sep 2026 · about EPSS
- Public exploit code
- No Nuclei template lists it
- Exploitability
- Exploitation Unlikely
- Publicly disclosed
- No
- Customer action
- Required: apply the update
- Component
- .NET
- Weakness
- CWE-59: Improper Link Resolution Before File Access ('Link Following')
- Issued by
- Microsoft
- Published
- 9 Jun 2026 · June 2026
- Last revised
- 9 Jun 2026
Updates that fix it
3 KBs| KB | Type | Restart | Applies to | Other CVEs |
|---|---|---|---|---|
| KB5097148 | Security Update | — | .NET 10.0 installed on Linux, .NET 10.0 installed on Mac OS, .NET 10.0 installed on Windows | All CVEs in KB5097148 |
| KB5097149 | Security Update | — | .NET 8.0, .NET 8.0 installed on Linux, .NET 8.0 installed on Mac OS and 1 more | All CVEs in KB5097149 |
| KB5097150 | Security Update | — | .NET 9.0 installed on Linux, .NET 9.0 installed on Mac OS, .NET 9.0 installed on Windows | All CVEs in KB5097150 |