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CVE-2026-96222

HIGH 7.4

Published 2026-10-13 · Last modified 2026-10-20

Improper certificate validation in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.

ELEVATED IMPACT

Severe if exploited (CVSS 7.4), but no known exploitation and low modeled probability. Patch on a normal cadence.

Exploitation likelihood

0.6%chance of exploitation in 30 days · 46th percentile

○ In CISA KEV ○ Public exploit / PoC

Impact if exploited

7.4CVSS 3.1 · HIGH

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityNone

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ⚠Complexity: Needs a race window or specific setup

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept & exploit code

Test against your own equipment

curl -s https://vulnpedia.com/cve/CVE-2026-96222/poc.jsonMachine-readable PoC index for this CVE (for automation).

Listed for defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-96222/poc.json

Affected

Vendors Microsoft Apple Linux

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 System.Security.Cryptography.Xml Windows 10 Version 1607

Weakness (CWE)

  • CWE-295: : Improper Certificate Validation

CVSS vector

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

Known Affected Software Configurations

VendorProductVersion range
MicrosoftWindows 10 1607< 10.0.14393.9612
MicrosoftWindows 10 1607< 10.0.14393.9612
MicrosoftWindows 10 1809< 10.0.17763.9376
MicrosoftWindows 10 1809< 10.0.17763.9376
MicrosoftWindows Server 2012*
MicrosoftWindows Server 2012r2
MicrosoftWindows Server 2016< 10.0.14393.9612
MicrosoftWindows Server 2019< 10.0.17763.9376
MicrosoftWindows Server 2022< 10.0.20348.5761
MicrosoftWindows Server 2025< 10.0.26100.33650
Microsoft.Net≥ 8.0.0 and < 8.0.5
MicrosoftVisual Studio 2022≥ 17.14.0 and < 17.14.42
MicrosoftVisual Studio 2026≥ 18.10.0 and < 18.10.4
Microsoft.Net Framework4.8.1
Microsoft.Net Framework4.8
Microsoft.Net Framework4.6.2
Microsoft.Net Framework4.7
Microsoft.Net Framework4.7.1
Microsoft.Net Framework4.7.2
Microsoft.Net Framework3.5
Microsoft.Net Framework4.8
Microsoft.Net Framework3.5
Microsoft.Net Framework4.8.1
Microsoft.Net Framework3.5
Microsoft.Net Framework4.6.2
Microsoft.Net Framework4.7
Microsoft.Net Framework4.7.1
Microsoft.Net Framework4.7.2
Microsoft.Net Framework3.5

All CVSS metrics

  • HIGH 7.4 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C
  • HIGH 7.4 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References

Patches & mitigations

Sources: NVD · CVE.org · EPSS