How severe is CVE-2026-97801?

CVE-2026-97801 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-97801 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-97801?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-97801 published?

CVE-2026-97801 was published on 2026-10-13.

CVE-2026-97801

CVE-2026-97801 is a high-severity vulnerability with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1287.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1287
Published: 2026-10-13
Last modified: 2026-10-13

Description

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

Frequently asked questions

What is CVE-2026-97801?: Improper validation of specified type of input in .NET Framework allows an unauthorized attacker to perform tampering over a network.
How severe is CVE-2026-97801?: CVE-2026-97801 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-97801 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-97801?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-97801 published?: CVE-2026-97801 was published on 2026-10-13.

References

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

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