CVE-2026-83646
Active Directory Federation Services (AD FS) Spoofing Vulnerability
At a glance
- Severity
- MEDIUM 4.8
- EPSS
- EPSS 0.42 % · percentile 36 (2026-10-27)
- State
- PUBLISHED
- Published
- Updated
- Assigner
- microsoft
- NVD status
- Awaiting Analysis
Description
Url redirection to untrusted site ('open redirect') in Active Directory Federation Services (AD FS) allows an authorized attacker to perform spoofing over a network.
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 4.8 | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C | microsoft |
| CVSS 3.1 | MEDIUM 4.8 | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N | NVD · secure@microsoft.com (Secondary) |
Weaknesses (CWE)
European references
- ENISA EUVD · EUVD-2026-99311
- GCVE · GCVE-0-2026-83646
CERT-FR advisories
- CERTFR-2026-AVI-1314 — Multiples vulnérabilités dans Microsoft Windows · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Microsoft · Windows 10 Version 1607 | affected 10.0.14393.0 < 10.0.14393.9612 |
| Microsoft · Windows 10 Version 1809 | affected 10.0.17763.0 < 10.0.17763.9376 |
| Microsoft · Windows Server 2016 | affected 10.0.14393.0 < 10.0.14393.9612 |
| Microsoft · Windows Server 2016 (Server Core installation) | affected 10.0.14393.0 < 10.0.14393.9612 |
| Microsoft · Windows Server 2019 | affected 10.0.17763.0 < 10.0.17763.9376 |
| Microsoft · Windows Server 2019 (Server Core installation) | affected 10.0.17763.0 < 10.0.17763.9376 |
| Microsoft · Windows Server 2022 | affected 10.0.20348.0 < 10.0.20348.5761 |
| Microsoft · Windows Server 2025 | affected 10.0.26100.0 < 10.0.26100.33650 |
| Microsoft · Windows Server 2025 (Server Core installation) | affected 10.0.26100.0 < 10.0.26100.33650 |
References
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |