CVE-2026-18886

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Improper Access Control in ServiceNow AI Platform

Publication date: 2026-08-27

Last updated on: 2026-09-03

Assigner: ServiceNow

Description

ServiceNow has remediated an improper access control vulnerability that was identified in the ServiceNow AI platform. This vulnerability could enable an unauthenticated user, in certain circumstances, to create or modify instance data beyond what was intended, resulting in privilege escalation. ServiceNow deployed a security update to hosted instances and ServiceNow provided the update to our partners and self-hosted customers. We are not currently aware of exploitation against ServiceNow instances. We recommend customers promptly apply appropriate updates or upgrade to a patched release if they have not already done so.

CVSS Scores

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Meta Information

Published

2026-08-27

Last Modified

2026-09-03

Generated

2026-09-17

AI Q&A

2026-08-28

EPSS Evaluated

2026-09-15

NVD

CVE-2026-18886

Affected Vendors & Products

Vendor	Product	Version / Range
servicenow	ai_platform	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-284	The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Attack-Flow Graph

Executive Summary

This is an improper access control vulnerability in ServiceNow's AI platform that could allow an unauthenticated user to create or modify instance data beyond intended limits, potentially leading to privilege escalation.

Detection Guidance

This vulnerability is specific to the ServiceNow AI platform and requires checking for the latest security updates. Since ServiceNow has already deployed patches, detection involves verifying if your instance is running a patched version. Check your ServiceNow instance version against the latest patched release provided by ServiceNow.

Impact Analysis

An attacker could exploit this to gain unauthorized access or modify data, potentially affecting system integrity, confidentiality, or availability. ServiceNow states no known exploitation has occurred.

Compliance Impact

The vulnerability could allow unauthorized data modification, potentially violating confidentiality and integrity requirements in GDPR and HIPAA. Unauthenticated access and privilege escalation risks may lead to unauthorized exposure or alteration of sensitive personal or health data, increasing compliance risks.

Mitigation Strategies

Apply the security update provided by ServiceNow to hosted instances or upgrade to a patched release if using self-hosted versions. Ensure all instances are updated promptly to prevent potential privilege escalation.

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