---
id: CVE-2026-86858
title: >-
  ServiceNow has remediated an improper access control security issue that was
  identified in the ServiceNow AI Platform
summary: >-
  ServiceNow has remediated an improper access control security issue that was
  identified in the ServiceNow AI Platform. This security issue could enable an
  unauthenticated user, in certain circumstances, to create, modify, or delete
  insta…
severity: high
cvss: 8.7
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N'
cwe:
  - CWE-284
vendor: ServiceNow
product: ServiceNow AI Platform
affected:
  - ai_platform < Yokohama Patch 13 Hot Fix 5a
  - ai_platform < Zurich Patch 10 Hot Fix 3b
  - ai_platform < Zurich Patch 10 Hot Fix 4a W32
  - ai_platform < Zurich Patch 11 Hot Fix 3
  - ai_platform < Australia Patch 2 Hot Fix 4b W32
  - ai_platform < Australia Patch 4 Hot Fix 3
  - ai_platform < Australia Patch 5
published: '2026-09-24'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T21:00:46.893'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86858'
references:
  - url: >-
      https://support.servicenow.com/kb?id=kb_article_view&sysparm_article=KB3159623
    label: psirt@servicenow.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-24T19:14:16.789932Z'
cvssSource: cna
ingestedAt: '2026-09-24T19:50:30.717Z'
epss: 0.00273
epssPercentile: 0.17594
---

## Overview

ServiceNow has remediated an improper access control security issue that was identified in the ServiceNow AI Platform. This security issue could enable an unauthenticated user, in certain circumstances, to create, modify, or delete instance data beyond what was intended.





In August 2026, 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 malicious exploitation against ServiceNow instances. We recommend customers promptly apply appropriate updates or upgrade to a patched release if they have not already done so.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.