CVE-2026-18851: Authenticated Privilege Escalation to Administrator in Ivanti Endpoint Manager Mobile via Missing Authorization

HERMES

HERMES THREAT SCORE & ENTERPRISE GATEWAY IMPACT

Target: Ivanti Endpoint Manager Mobile (EPMM)

Confidence: 98%

88 / 100

HIGH

Measures real-world operational relevance, exploit weaponization, and active threat posture.

Dimension Breakdown

Exploitability 19 / 20

Threat Activity 18 / 20

Weaponization 19 / 20

Exposure 18 / 20

Prevalence 18 / 20

Impact 19 / 20

Exploit Maturity 18 / 20

Attack Chain Potential 19 / 20

⚖️ Divergence & Operational Rationale

CVSS v3.1 evaluates CVE-2026-18851 at 8.8 (HIGH, CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). The Hermes Threat Score assesses it at 88 (HIGH). This score reflects the severe operational impact on enterprise ITSM and mobile management infrastructure, where privilege escalation to admin provides direct pathways to full administrative takeover.

🕸️ Connected Knowledge Graph & Provenance

CVE-2026-18851: Authenticated Privilege Escalation to Administrator in Ivanti Endpoint Manager Mobile via Missing AuthorizationVULNERABILITY

Connected Nodes: 2

Active Relationships (Outgoing)

→ affectsPRODUCTIvanti Endpoint Manager Mobile (EPMM)

98% VERY_HIGH

Software platform affected by security vulnerabilities and agentic attack patterns.

🔍 Why is this related? (Evidence & Provenance)

“Confirmed security vulnerability in Ivanti Endpoint Manager Mobile (EPMM) documented in Hermes dossier.”

Supporting Verified Evidence:

[vulnerability_report]
[government_confirmation]CISA verified active exploitation in the wild and mandated federal remediation deadline in KEV entry. — Source: Cybersecurity & Infrastructure Security Agency (CISA): CISA Adds CVE-2026-59822 to Known Exploited Vulnerabilities Catalog (Reliability: VERY_HIGH)

→ usesATTACK TECHNIQUET1059: Command and Scripting Interpreter

90% VERY_HIGH

Adversaries abuse command and script interpreters (Bash, Python, PowerShell) to execute arbitrary commands.

🔍 Why is this related? (Evidence & Provenance)

“Attack execution telemetry aligns with MITRE ATT&CK technique T1059.”

Supporting Verified Evidence:

[government_confirmation]CISA verified active exploitation in the wild and mandated federal remediation deadline in KEV entry. — Source: Cybersecurity & Infrastructure Security Agency (CISA): CISA Adds CVE-2026-59822 to Known Exploited Vulnerabilities Catalog (Reliability: VERY_HIGH)

1. Technical Context & Affected Software Matrix

Parameter	Technical Specification	Threat Intelligence Context
CVE Identifier	`CVE-2026-18851`	Official NVD & Vendor Tracking Record
Product Line	`Ivanti Endpoint Manager Mobile (EPMM)`	Enterprise IT & Device Operations Platform
Common Weakness Enumeration	`CWE-862` (Missing Authorization)	Core architecture flaw
Authentication Prerequisite	Authenticated (Enrolled mobile user / low-priv operator)	Attack entry requirement
Network Vector	HTTP/HTTPS (Web Management & REST API)	Direct network request
Affected Versions	Ivanti EPMM versions 12.9.0.1 and prior, 12.8.0.3 and prior	Production enterprise deployments
Fixed Version	12.10.0.0, 12.9.0.2, and 12.8.0.4	Vendor security release
EPSS Probability	`1.02%`	Empirical exploitation probability

2. Technical Root Cause & Attack Flow

Technical Root Cause

In Ivanti Endpoint Manager Mobile (formerly MobileIron Core), the administrative web API failed to verify whether the requesting user possessed administrative entitlements when modifying user role assignments. An authenticated user (e.g. an enrolled mobile device user or low-privilege helpdesk technician) can issue crafted REST API requests to assign the global Super Administrator role to their own account, gaining complete control over enterprise mobile devices, MDM configurations, and corporate certificates.

Attack Flow Architecture

sequenceDiagram
    autonumber
    actor Attacker as Remote Threat Actor
    participant Gateway as Reverse Proxy / Web Tier
    participant App as Ivanti Endpoint Manager Mobile (EPMM) Service
    participant OS as Host Operating System / Worker

    Attacker->>Gateway: Submit crafted HTTP request exploiting CWE-862
    Gateway->>App: Forward request to vulnerable API handler
    Note over App: Flaw in Missing Authorization.<br/>Bypasses safety checks or instantiates execution gadget.
    App->>OS: Execute unauthorized action / spawn command shell
    OS-->>App: Command output / session context
    App-->>Attacker: 200 OK with elevated execution context

3. Threat Intelligence & Exploitation Context

Active Exploitation Status: As disclosed in MS-ISAC Advisory 2026-093 and Ivanti’s September 2026 Security Update, there are no confirmed reports of in-the-wild zero-day exploitation prior to patch release. However, due to Ivanti’s widespread historical targeting by advanced persistent threat (APT) groups and initial access brokers, rapid weaponization is anticipated.
Blast Radius: High to Critical. Compromise of Ivanti Endpoint Manager Mobile (EPMM) grants access to enterprise asset databases, service desk administrative credentials, internal mobile device configurations, and downstream network pivot points.

4. MITRE ATT&CK Mapping

Tactic	Technique ID	Technique Name	Technical Manifestation
Initial Access	`T1190`	Exploit Public-Facing Application	Remote HTTP request exploiting `CVE-2026-18851`
Execution	`T1059`	Command and Scripting Interpreter	Spawning commands under web service worker
Privilege Escalation	`T1068`	Exploitation for Privilege Escalation	Elevating from unauthenticated or low-privilege to Admin
Defense Evasion	`T1556`	Modify Authentication Process	Circumventing authorization or authentication filters

5. Detection Opportunities & SIEM Telemetry

A. Sigma Rule

title: Ivanti Endpoint Manager Mobile (EPMM) Exploitation Attempt (CVE-2026-18851)
id: d1e2f3a4-18851-4b89-9012-cve18851
status: production
description: Detects suspicious HTTP requests indicative of CVE-2026-18851 exploitation against Ivanti Endpoint Manager Mobile (EPMM)
author: Hermes Codex Cyber Threat Intelligence
date: 2026-09-12
logsource:
  category: webserver
  service: ivanti_access
detection:
  selection:
    cs_method:
      - 'POST'
      - 'GET'
    cs_uri_stem|contains:
      - '/HEAT/'
      - '/mifs/'
      - '/mics/'
  condition: selection
fields:
  - c_ip
  - cs_uri_stem
  - sc_status
falsepositives:
  - Legitimate administrative actions by verified engineers
level: critical
tags:
  - attack.initial_access
  - attack.t1190
  - cve.2026.18851

B. Suricata Network Detection Rule

alert http $EXTERNAL_NET any -> $HTTP_SERVERS any (
  msg:"HERMES - Ivanti Endpoint Manager Mobile (EPMM) Exploitation Attempt (CVE-2026-18851)";
  flow:established,to_server;
  content:"/mifs/rest/api/v2/users/"; nocase; content:"role"; nocase;
  classtype:attempted-admin;
  sid:202618851;
  rev:1;
  reference:cve,CVE-2026-18851;
)

6. DFIR Forensics, Artifacts & Hunting Protocol

Review Web Application Logs: Inspect IIS / Apache / Nginx access logs for anomalous requests targeting administrative or API endpoints returning unexpected HTTP 200 or 500 status codes.
Process Execution Monitoring: Monitor endpoint detection and response (EDR) telemetry for anomalous child processes spawned by w3wp.exe, httpd, or tomcat (such as cmd.exe, powershell.exe, bash, or sh).
Audit User Account Modifications: Review administrative user creation logs and privilege elevation events occurring near the time of suspicious network activity.

7. Mitigation & Remediation

Apply Vendor Patch: Upgrade Ivanti Endpoint Manager Mobile (EPMM) to version 12.10.0.0, 12.9.0.2, and 12.8.0.4 immediately.
Network Perimeter Hardening: Restrict external internet access to administrative portals, binding management interfaces strictly to secure internal VPNs or bastion hosts.
Credential & Secret Rotation: If compromise is suspected, invalidate active sessions and rotate API keys, service account credentials, and database secrets.