Vulnerability in Microsoft .Net Framework 3.5
CVE-2026-96222
Improper certificate validation in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.
Vulnerability class: Improper Certificate Validation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Microsoft .Net Framework 3.5
- 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
- Microsoft .Net Framework 3.5 And 4.8.1
- Microsoft .Net Framework 4.6.2/4.7/4.7.1/4.7.2
- Microsoft .Net Framework 4.8
- Microsoft .Net Framework 4.8.1
- Microsoft Visual Studio 2022 Version 17.14
- Microsoft Visual Studio 2026 Version 18.10
Weakness classification (CWE)
References
- Active Directory Federation Services (AD FS) Spoofing Vulnerability (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2026-96222?
- CVE-2026-96222 is a high-severity vulnerability in Microsoft .Net Framework 3.5, classified under Improper Certificate Validation. CVSS score: 7.4/10. Published 2026-10-13.
- How severe is CVE-2026-96222?
- High severity. CVSS v3 base score is 7.4 out of 10.