SEPTEMBER 14, 2026
Live Feed
Back to database
Case File

CVE-2026-90452

MEDIUM · CVSS 6 EPSS 0.09%

Source: NVD + CISA KEV + EPSS · Published 2026-09-11 · Last synced 2026-09-14

CyberRota Analysis

AI-Generated

Exchange servers are vulnerable due to inadequate verification of the identity provider's server certificate during token discovery and credential exchange processes. This flaw allows an attacker on the network path to impersonate the identity provider, potentially issuing forged authentication tokens that could compromise the security of the deployment. Organizations using Exchange should prioritize patching this vulnerability to mitigate the risk of unauthorized access.

CVE
CVE-2026-90452
Severity
MEDIUM
CVSS
6
EPSS
0.09%
Exchange

Original NVD Description

Requests from the reverse proxy to the identity-provider service for token discovery, introspection, and credential exchange do not verify the identity provider's server certificate. An attacker positioned on the network path between the proxy and the identity provider could impersonate the identity provider and issue forged authentication tokens accepted by the deployment.