CVE-2026-10523 in Ivanti Sentry allows unauthenticated attackers to create administrative accounts via an alternate API pathway that bypasses the normal authentication layer. This is classified as CWE-288 (Authentication Bypass Using an Alternate Path/Channel), meaning the attacker isn't exploiting a flaw within the authentication logic—they're using a channel that was never meant to enforce auth in the first place. The CVSS 9.8 is deserved, but the EPSS score of 0.5187 is the more urgent signal: over 50% probability of active exploitation within 30 days means you should assume this is already being scanned for and weaponized.

Patch-only remediation will fail you here. The alternate channel likely creates persistent admin accounts that survive the update. Your response must be: rotate every credential associated with this system immediately, audit for admin accounts created after your known-good deployment date, and treat the entire system as potentially compromised. If you cannot definitively distinguish attacker-created accounts from legitimate ones, rebuild from known-good configuration rather than patch-in-place.

The deeper problem this CVE exposes: administrative account creation was apparently treated as a non-security-relevant provisioning action at the API layer, collapsing the distinction between authentication and authorization. This is an architectural failure, not merely a missing auth check, and it suggests Ivanti's provisioning interface was never properly isolated from production. Network segmentation should have prevented this pathway from being internet-facing—verify whether it was.