Introduction
An improper input validation flaw in Progress Software MOVEit Automation's service backend command port interfaces allows a low privilege, network based attacker to escalate privileges, potentially reaching administrative control. Given the MOVEit product line's history as a prime target for ransomware operators, this vulnerability warrants immediate attention from any organization running affected versions.
MOVEit Automation is a workflow automation engine that integrates with the MOVEit managed file transfer platform, orchestrating scheduled and event driven file transfers across enterprise environments. It is widely deployed in healthcare, financial services, and government sectors where secure, auditable file movement is a regulatory requirement.
Technical Information
CVE-2026-5174 is rooted in improper input validation (CWE-20) within the service backend command port interfaces of MOVEit Automation. The CVSS 3.1 base score is 7.7, with a vector of AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H. This vector tells us several important things about the attack surface: exploitation is possible over the network, attack complexity is low, only low level privileges are required, no user interaction is needed, and the scope is changed, meaning the impact extends beyond the vulnerable component itself. The impact profile shows no confidentiality or integrity loss but high availability impact.
The flaw exists in how the MOVEit Automation service backend command port processes incoming requests. When an authenticated user with low privileges sends specially crafted input to these interfaces, the application fails to properly validate that input before processing it. This insufficient validation allows the attacker to escalate their privileges, either locally on the system or across the network boundary.
The attack flow, based on the available advisory details, proceeds as follows:
- The attacker authenticates to the MOVEit Automation environment with a low privilege account. This could be any valid user credential with basic access.
- The attacker identifies and connects to the service backend command port interface.
- The attacker submits crafted input that exploits the improper validation logic in the command port handler.
- The application processes the input without adequate validation, resulting in privilege escalation.
- With elevated privileges, the attacker can perform unauthorized actions, potentially including administrative operations, access to sensitive data, or disruption of automation workflows.
Progress Software notes that observable symptoms of exploitation include unexpected privilege escalation, unauthorized access attempts, or anomalous activity in the MOVEit Automation audit logs. The vulnerability was discovered by researchers at Airbus SecLab and was disclosed alongside CVE-2026-4670, an authentication bypass vulnerability, in the same critical security alert bulletin.
It is worth noting that the changed scope (S:C) in the CVSS vector indicates that a successful exploit can affect resources beyond the MOVEit Automation component itself. Combined with the high availability impact, this suggests that exploitation could disrupt dependent file transfer workflows and downstream systems.
Affected Systems and Versions
The following MOVEit Automation versions are affected:
| Affected Version Range | Fixed Version |
|---|---|
| MOVEit Automation 2025.1.0 through 2025.1.4 | 2025.1.5 |
| MOVEit Automation 2025.0.0 through 2025.0.8 | 2025.0.9 |
| MOVEit Automation 2024.0.0 through 2024.1.7 | 2024.1.8 |
| Versions prior to 2024.0.0 | Upgrade to a supported fixed version |
Organizations running any version prior to 2024.0.0 are on unsupported releases and must upgrade to a currently supported and patched branch. Administrators can verify their installed version by opening the MOVEit Automation Web Admin, navigating to Help, and selecting About.
The only remediation path is a full installer upgrade; Progress Software has confirmed that no workarounds exist. There will be an outage to the system during the upgrade process, so organizations should plan maintenance windows accordingly.
After upgrading, organizations should review audit logs for any signs of anomalous activity, unauthorized access, or unexpected privilege escalation. If indicators of compromise are identified, Progress Software recommends opening a new Technical Support case.
Vendor Security History
Progress Software has a significant and well documented security history with the MOVEit product line. In 2023, a severe zero day vulnerability (CVE-2023-34362) in MOVEit Transfer was exploited by the Clop (CL0P) ransomware gang in a mass data theft campaign. That incident impacted more than 2,500 organizations, with over 80 percent based in the United States. The FBI and CISA issued joint advisories in response to the widespread exploitation.
This precedent is directly relevant to CVE-2026-5174. Threat actors have demonstrated both the capability and the motivation to rapidly weaponize MOVEit vulnerabilities. The Clop group in particular has shown a pattern of targeting managed file transfer and automation platforms. While there is no confirmed active exploitation of CVE-2026-5174 as of the disclosure date, the historical pattern strongly suggests that adversaries will attempt to reverse engineer the patches and develop exploits quickly.
References
- NVD: CVE-2026-5174
- CVE Record: CVE-2026-5174
- MOVEit Automation Critical Security Alert Bulletin, April 2026 (CVE-2026-4670, CVE-2026-5174)
- Progress Software: MOVEit Automation 2025 Upgrade Guide
- Progress Software: MOVEit Automation 2024 Upgrade Guide
- Progress Software: MOVEit Product Lifecycle
- CISA Advisory: CL0P Ransomware Gang Exploits CVE-2023-34362 MOVEit Vulnerability
- Kroll: Clop Ransomware Likely Sitting on MOVEit Transfer Vulnerability
- Progress Software (Wikipedia)
