7.5 High

Improper validation of specified type of input in .NET Framework allows an unauthorized attacker to perform tampering over a network.

CVE-2026-97801

Assessment

CVSS: 7.5 (v3.1)
Severity: High
EPSS: 0.73% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 13 October 2026
Last updated: 31 October 2026
Affected: Microsoft · Microsoft .NET Framework 4.8, Microsoft .NET Framework 3.5, Microsoft .NET Framework 3.5 AND 4.8.1, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2, Microsoft .NET Framework 3.5 AND 4.7.2, Microsoft .NET Framework 3.5 AND 4.8
Assigner: microsoft

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C

At the source

EUVD (ENISA)

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97801

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