Quick answers
- Is CVE-2026-83646 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-83646 being exploited in the wild.
- How severe is CVE-2026-83646?
- Medium severity, with a CVSS score of 4.8, published 13 October 2026.
- Which products and versions are affected?
- Microsoft Active Directory Federation Services.
- Is there a fix for CVE-2026-83646?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-83646 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-83646?
- Check whether you run Microsoft Active Directory Federation Services. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
This is an open redirect vulnerability in AD FS that allows an authorized attacker to craft URLs that redirect users to untrusted external sites. The vulnerability requires existing authorization to the AD FS system. An attacker could use this to perform credential harvesting or social engineering through trusted-looking redirect chains.
Affected products
- Microsoft Active Directory Federation Services
Timeline
- 2026-10-13: disclosed