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. This vulnerability has been classified as critical due to its potential impact on confidentiality, integrity, and availability.
The CVSS score for this vulnerability is 9.3, indicating a critical severity level. Organizations using ServiceNow should be aware that this vulnerability poses a significant risk, potentially allowing attackers to gain unauthorized access to sensitive operations and data.
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. Organizations should prioritize patching immediately.
Risk to organizations includes unauthorized access to sensitive functionalities, which may result in significant breaches of data and compliance violations. Therefore, applying the relevant security updates promptly is crucial.
For organizations that have not yet applied the security update, it is essential to do so as soon as possible to mitigate the risk associated with this vulnerability.
Vulnerability Details
This vulnerability allows an unauthenticated user to impersonate another user in the ServiceNow AI Platform, potentially leading to unauthorized actions being performed in the context of an impersonated user.
The vulnerability is classified under CWE-250, which pertains to unauthorized access due to improper authentication mechanisms.
Organizations are advised to update to the latest versions of the affected components, namely now_assist_ai_agents and virtual_agent_api, to ensure they are protected against this vulnerability.
Technical Analysis
The root cause of this vulnerability stems from the ability of the ServiceNow AI Platform to allow unauthenticated users to perform actions as if they were authorized users, which indicates a flaw in the access control mechanisms.
The attack vector is classified as network-based, and the attack complexity is low, meaning that an attacker can exploit this vulnerability without requiring sophisticated techniques or extensive knowledge.
There are no privileges required for the attack, and no user interaction is necessary, making this vulnerability particularly dangerous.
The impact on confidentiality, integrity, and availability is high, as attackers may gain access to sensitive data and perform actions that can compromise system operations.
Risk & Impact Analysis
Organizations using the affected ServiceNow components face a significant risk of unauthorized access and manipulation of sensitive data. The potential for exploitation could lead to severe data breaches and compliance challenges.
With a critical CVSS score of 9.3, the urgency for remediation is high. Organizations should address this vulnerability in their immediate patch cycle to prevent unauthorized access and operational disruptions.
The blast radius includes any user or system that interacts with the ServiceNow AI Platform, potentially affecting a wide range of operations and data integrity.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability affects the following products from ServiceNow:
1. now_assist_ai_agents (versions prior to 5.1.18 and from 5.2.0 to 5.2.19). 2. virtual_agent_api (versions prior to 3.15.2 and from 4.0.0 to 4.0.4).
Mitigation & Remediation
Organizations should prioritize applying the security updates provided by ServiceNow to mitigate the risks associated with this vulnerability. Upgrading to the latest versions of the affected components is essential.
If you have not yet updated, please refer to the penetration testing services to validate your security posture and ensure that similar vulnerabilities are addressed effectively.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor for the following indicators:
1. Unusual user activity patterns, particularly actions that should require authentication. 2. Audit logs indicating unauthorized access attempts. 3. Changes to user roles or permissions without proper authorization.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2025-12420 lies in its demonstration of the potential for unauthorized access through flaws in access controls within AI-driven platforms. Organizations should take this as a lesson to strengthen their security measures, particularly concerning user authentication and authorization.
Security teams are encouraged to adopt a proactive approach by implementing comprehensive security assessments, such as penetration testing methodologies, to identify and remediate similar vulnerabilities before they can be exploited.
Furthermore, organizations should remain informed about emerging threats and trends, leveraging resources such as vulnerability management programs to stay ahead of potential risks and ensure robust defense mechanisms are in place.
Finally, organizations should consider engaging in red teaming exercises to further enhance their security posture and resilience against sophisticated threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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