CVE-2025-12420: ServiceNow Now Assist Ai Agents

Critical severity, CVSS 9.8. EPSS: 53.2% chance of exploitation in the next 30 days.

A vulnerability has been identified in the ServiceNow AI Platform that could enable an unauthenticated user to impersonate another user and perform the operations that the impersonated user is entitled to perform. ServiceNow has addressed this vulnerability by deploying a relevant security update to  hosted instances in October 2025. Security updates have also been provided to ServiceNow self-hosted customers, partners, and hosted customers with unique configurations. Additionally, the vulnerability is addressed in the listed Store App versions. We recommend that customers promptly apply an appropriate security update or upgrade if they have not already done so.

Affected products

• ServiceNow Now Assist Ai Agents: before 5.1.18 (fixed in 5.1.18); from 5.2.0, before 5.2.19 (fixed in 5.2.19)
• ServiceNow Virtual Agent API: before 3.15.2 (fixed in 3.15.2); from 4.0.0, before 4.0.4 (fixed in 4.0.4)

Published 2026-01-12. Last modified 2026-06-17.