CVE-2026-5174

Executive Summary

CVE-2026-5174 is a critical improper input validation vulnerability in Progress Software MOVEit Automation that allows privilege escalation. The flaw exists in the application's handling of user-supplied input, enabling an authenticated attacker to elevate their privileges within the system. This could lead to unauthorized access to sensitive data, modification of system configurations, or full compromise of the MOVEit Automation server. The vulnerability affects multiple versions of the software, and no public exploit code or proof-of-concept has been released at this time. The EPSS score is 0.0%, indicating low exploitation activity in the wild, but the high CVSS score of 7.7 warrants immediate attention.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
• Base Score: 7.7 (High)
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: Low (PR:L)
• User Interaction: None (UI:N)
• Scope: Unchanged (S:U)
• Confidentiality Impact: High (C:H)
• Integrity Impact: High (I:H)
• Availability Impact: High (A:H)

Threat Level: High. The vulnerability requires low privileges and no user interaction, making it attractive for attackers who have already gained initial access. Successful exploitation could lead to full system compromise.

Deep Dive & Mechanics

The vulnerability resides in the input validation logic of MOVEit Automation. The application fails to properly sanitize or validate user-supplied input before processing it in a privileged context. This allows an authenticated attacker to craft malicious input that, when processed, executes with elevated permissions.

Root Cause: The software does not enforce proper checks on input parameters used in internal function calls or API endpoints that perform actions with higher privileges. This could be due to insufficient validation of user roles or permissions before executing sensitive operations.

Attack Vector: An attacker with a valid low-privileged account sends specially crafted requests to the MOVEit Automation web interface or API. The malicious input bypasses the intended privilege checks, allowing the attacker to perform actions reserved for administrators, such as creating new users, modifying system files, or executing arbitrary commands.

Impact: Successful exploitation can lead to:

• Full administrative control over the MOVEit Automation instance.
• Access to all managed file transfer data.
• Lateral movement within the network.
• Potential data exfiltration or ransomware deployment.

Vulnerable vs. Patched Code

The exact code changes are not publicly available, but the patch addresses the improper input validation by implementing stricter checks on user-supplied data before processing it in privileged contexts.

Vulnerable Code (Conceptual):

def process_request(user_input):
    # No validation of user_input
    execute_privileged_action(user_input)

Patched Code (Conceptual):

def process_request(user_input):
    if not validate_user_input(user_input):
        raise PermissionError("Invalid input")
    execute_privileged_action(user_input)

The patch likely includes:

• Input sanitization functions.
• Role-based access control checks before executing sensitive operations.
• Logging of all privilege escalation attempts.

Exploitation & Lab Setup

Red Team

Prerequisites:

• Valid low-privileged account on MOVEit Automation.
• Network access to the MOVEit Automation server.

Exploitation Steps:

1. Authenticate to the MOVEit Automation web interface with the low-privileged account.
2. Identify API endpoints or web forms that accept user input and perform privileged actions.
3. Craft a malicious payload that bypasses input validation, such as:
   • SQL injection to modify user roles.
   • Command injection to execute system commands.
   • Path traversal to overwrite configuration files.
4. Send the crafted request and verify privilege escalation by accessing admin-only features.

Example Payload (Conceptual):

POST /api/update_user HTTP/1.1
Host: moveit-automation.example.com
Content-Type: application/json

{
  "user_id": 1,
  "role": "admin",
  "input": "'; UPDATE users SET role='admin' WHERE id=1; --"
}

Blue Team

Detection:

• Monitor for unusual API calls from low-privileged users.
• Alert on failed privilege escalation attempts.
• Review logs for unexpected changes to user roles or permissions.

Hunting:

• Search for requests containing SQL injection patterns or command injection characters.
• Analyze network traffic for anomalous payloads in POST requests.
• Correlate user activity with privilege changes.

Response:

• Immediately revoke the compromised account.
• Isolate the affected server.
• Restore from a known good backup.
• Apply the vendor patch.

Indicators of Compromise (IOCs)

• Network IOCs:

  • Unusual HTTP POST requests to /api/update_user or similar endpoints.
  • Requests containing SQL injection patterns (e.g., ' OR '1'='1).
  • Requests with command injection characters (e.g., ;, |, &&).

• System IOCs:

  • New user accounts with administrative privileges.
  • Modified configuration files in the MOVEit Automation directory.
  • Unexpected processes running with elevated privileges.

• Log IOCs:

  • Log entries showing privilege escalation attempts.
  • Failed authentication followed by successful admin actions.
  • Anomalous API calls from low-privileged users.

Detection Engineering

YARA Rule

rule CVE_2026_5174_MOVEit_PrivEsc {
    meta:
        description = "Detects exploitation attempts of CVE-2026-5174 in MOVEit Automation logs"
        author = "Valters IT"
        date = "2026-01-01"
        reference = "CVE-2026-5174"
    strings:
        $sql_injection = /'.*OR.*'='/
        $cmd_injection = /[;&|]/
        $priv_esc = /role.*admin/i
    condition:
        any of ($sql_injection, $cmd_injection) and $priv_esc
}

Sigma Rule

title: CVE-2026-5174 MOVEit Automation Privilege Escalation
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects privilege escalation attempts via input validation bypass in MOVEit Automation
author: Valters IT
date: 2026-01-01
logsource:
    category: application
    product: moveit_automation
detection:
    selection:
        EventID: 4624
        User: "low_priv_user"
        TargetUser: "admin"
    condition: selection
falsepositives:
    - Legitimate admin actions
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2026-5174 MOVEit Automation Privilege Escalation Attempt"; flow:to_server,established; content:"POST"; http_method; content:"/api/"; http_uri; pcre:"/(UPDATE|INSERT|DELETE|DROP|EXEC)/i"; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Upgrade to the patched versions:
   • MOVEit Automation 2025.1.5
   • MOVEit Automation 2025.0.9
   • MOVEit Automation 2024.1.8
   • MOVEit Automation 2024.0.0 or later
2. If immediate patching is not possible, restrict network access to the MOVEit Automation server.
3. Review and revoke unnecessary user accounts.

Long-term Mitigations:

• Implement strict input validation for all user-supplied data.
• Enforce the principle of least privilege for all accounts.
• Enable comprehensive logging and monitoring.
• Conduct regular security audits and penetration testing.

Workarounds:

• Disable unused API endpoints.
• Use a web application firewall (WAF) to filter malicious requests.
• Implement network segmentation to limit exposure.

Valters IT
Securing Digital Frontiers

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