CVE-2026-86858: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-g4fh-c3m5-g3pg
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CWE-284
Published
Advisory Summary

CVE-2026-86858 is a HIGH security vulnerability vulnerability (CWE-284: Improper Access Control) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-86858 at a Glance

CVE Identifier CVE-2026-86858
GHSA Identifier GHSA-g4fh-c3m5-g3pg
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-284: Improper Access Control
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-86858

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-86858, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-284: Improper Access Control, where the product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

References

NVD — CVE-2026-86858 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-86858
support.servicenow.com/kb WEB
https://support.servicenow.com/kb?id=kb_article_view&sysparm_article=KB3159623

Frequently Asked Questions

What is CVE-2026-86858?
CVE-2026-86858 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-284: Improper Access Control.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-86858?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-86858?
CVE-2026-86858 is classified under CWE-284: Improper Access Control (The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.).
How can I check Maven dependencies for CVE-2026-86858?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-g4fh-c3m5-g3pg",
  "modified" : "2026-09-24T21:32:48Z",
  "published" : "2026-09-24T21:32:48Z",
  "aliases" : [ "CVE-2026-86858" ],
  "details" : "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.\n\n\n\n\n\nIn 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.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "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/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"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-86858"
  }, {
    "type" : "WEB",
    "url" : "https://support.servicenow.com/kb?id=kb_article_view&sysparm_article=KB3159623"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-284" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-24T19:17:18Z"
  }
}