Unauthenticated Privilege Escalation via System Configuration Image Upload Processor

Summary

CVE	CVE-2026-18886
State	PUBLISHED
Assigner	SN
Source Priority	CVE Program / NVD first with legacy fallback
Published	2026-08-27 20:17:04 UTC
Updated	2026-08-29 04:18:04 UTC
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.

Risk And Classification

Primary CVSS: v4.0 10 CRITICAL from [email protected]

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.002470000 probability, percentile 0.158530000 (date 2026-08-30)

Problem Types: CWE-284 | CWE-284 CWE-284 Improper Access Control

Version	Source	Type	Score	Severity	Vector
4.0	[email protected]	Secondary	10	CRITICAL	`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/C...`
4.0	CNA	CVSS	10	CRITICAL	`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`

CVSS v4.0 Breakdown

Attack Vector

Network

Attack Complexity

Low

Attack Requirements

None

Privileges Required

None

User Interaction

None

Confidentiality

High

Integrity

High

Availability

High

Sub Conf.

High

Sub Integrity

High

Sub Availability

High

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

Source	Vendor	Product	Version	Platforms
CNA	ServiceNow	ServiceNow AI Platform	affected Xanadu Patch 11 Hot Fix 7a custom	Not specified
CNA	ServiceNow	ServiceNow AI Platform	affected Yokohama Patch 12 Hot Fix 3b custom	Not specified
CNA	ServiceNow	ServiceNow AI Platform	affected Yokohama Patch 13 Hot Fix 4 custom	Not specified
CNA	ServiceNow	ServiceNow AI Platform	affected Zurich Patch 7b Hot Fix 3 custom	Not specified
CNA	ServiceNow	ServiceNow AI Platform	affected Zurich Patch 8 Hot Fix 5 custom	Not specified
CNA	ServiceNow	ServiceNow AI Platform	affected Zurich Patch 9 Hot Fix 6 customZurich Patch 10 Hot Fix 2m (m-branch)	Not specified
CNA	ServiceNow	ServiceNow AI Platform	affected Zurich Patch 10 Hot Fix 2m (m-branch) custom	Not specified
CNA	ServiceNow	ServiceNow AI Platform	affected Zurich Patch 10 Hot Fix 3 (standard) custom	Not specified
CNA	ServiceNow	ServiceNow AI Platform	affected Zurich Patch 11 custom	Not specified
CNA	ServiceNow	ServiceNow AI Platform	affected Zurich Patch 12 custom	Not specified
CNA	ServiceNow	ServiceNow AI Platform	affected Australia Patch 2 Hot Fix 3 custom	Not specified
CNA	ServiceNow	ServiceNow AI Platform	affected Australia Patch 3 Hot Fix 2 custom	Not specified
CNA	ServiceNow	ServiceNow AI Platform	affected Australia Patch 3m custom	Not specified
CNA	ServiceNow	ServiceNow AI Platform	affected Australia Patch 4 custom	Not specified
CNA	ServiceNow	ServiceNow AI Platform	unknown Australia Patch 5 custom	Not specified

References

Reference	Source	Link	Tags
support.servicenow.com/kb	[email protected]	support.servicenow.com
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Kevin Gervot - Assetnote (en)

There are currently no legacy QID mappings associated with this CVE.