CVE-2026-90452: Cisa Malcolm

Medium severity, CVSS 5.3. EPSS: 0.1% chance of exploitation in the next 30 days.

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.

Affected products

• Cisa Malcolm: before v26.06.0 (fixed in v26.06.0)

Published 2026-09-11. Last modified 2026-10-02.