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Vulnerabilities

Vulnerability · CVE-2026-45491

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

Published Jun 9, 2026 · catalog updated Nov 11, 2026 · Improper link resolution before

Last checked Nov 11, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-45491. EPSS is 0.39%. Act only if a listed version of Improper link resolution before is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Improper link resolution before).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium5.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.39%
Remediation
Version ranges on file
Affected products
cpe microsoft/.net

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/.net< 10.0.9
  • cpe microsoft/.net< 8.0.28
  • cpe microsoft/.net< 9.0.17

How to fix CVE-2026-45491

  • Upgrade

    CVE-2026-45491 lists a fix boundary at 10.0.9. Compare the installed build with that boundary before you change production.

  • Version check

    Affected < 10.0.9

  • Advisory

    Open the nvd record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-45491. EPSS is 0.39%. Act only if a listed version of Improper link resolution before is installed.

Which versions are affected?

Compare what you have installed with < 10.0.9, < 8.0.28, < 9.0.17. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-59: Link Following. EPSS 0.39%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 9, 2026 · NIST NVD

    Detected

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

  2. Nov 11, 2026 · NIST NVD

    Updated

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

Sources

  • NIST NVDVulnerability recordCVE-2026-45491

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

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 11, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • NIST NVDNov 11, 2026