CVE-2026-18886CWE-284broken-access-control

CVE-2026-18886

published August 28, 2026

CVSS
10.0
EPSS
5%
Percentile
92.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
10.0 · NONE
CVSS v4.0
10.0 · 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
EPSS
0.05041 · 92.3th percentile
Weakness
CWE-284 · Improper Access Control
Published
2026-08-28T00:17Z
References (1)
EPSS history
Timeline
  • 27 AUG 19:00Z
    Unauthenticated Privilege Escalation via System Configuration Image Upload Processor
    cvelistv5