AIKIDO-2026-295878
Microsoft.Identity.Web is vulnerable to Open Redirect
65
Medium Risk
This Affects:
Microsoft.Identity.WebTL;DR
In Microsoft.Identity.Web, the redirectUri handling in /MicrosoftIdentity/Account/Challenge was hardened to allow only same-origin values and to reject encoded/proxy-bypass paths (%2f, %5c, etc.), preventing open-redirect/protocol-relative bypasses.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
Microsoft.Identity.Web is vulnerable to Open Redirect in versions 3.0.0 - 3.14.0 and 4.0.0 - 4.8.0.
How to fix this
Upgrade the Microsoft.Identity.Web library to the patch version.
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