CVE-2026-73807 Overview
CVE-2026-73807 is a missing authentication vulnerability [CWE-862] in the mySCADA myPRO Manager command API. The command API does not enforce authentication on privileged functions. An unauthenticated attacker with network access to the affected API can invoke management operations reserved for administrators. The flaw affects Operational Technology (OT) environments where myPRO Manager coordinates Supervisory Control and Data Acquisition (SCADA) deployments. CISA published guidance in ICS Advisory ICSA-26-258-03 describing the issue and its impact on industrial control systems.
Critical Impact
An unauthenticated network attacker can access privileged management functions of mySCADA myPRO Manager, compromising confidentiality, integrity, and availability of the SCADA management plane.
Affected Products
- mySCADA myPRO Manager (command API component)
- Refer to CISA ICS Advisory ICSA-26-258-03 for affected version ranges
- Fixed builds published on the mySCADA Download Page
Discovery Timeline
- 2026-09-15 - CVE-2026-73807 published to the National Vulnerability Database (NVD)
- 2026-09-16 - Last updated in NVD database
Technical Details for CVE-2026-73807
Vulnerability Analysis
The mySCADA myPRO Manager exposes a command API that dispatches privileged management operations. Under CWE-862 (Missing Authorization), the API accepts and processes requests to sensitive endpoints without validating whether the caller holds an authenticated session or the required privileges. Because myPRO Manager governs SCADA project deployment and configuration, unauthorized use of these endpoints allows an attacker to influence downstream industrial systems. The attack requires only network reachability to the API, with no user interaction or credentials.
Root Cause
The root cause is missing authorization enforcement on privileged command handlers. The API layer processes management requests without verifying the caller's identity or role against the operation being requested. Consult CISA ICS Advisory ICSA-26-258-03 and the corresponding CSAF advisory document for the authoritative technical description.
Attack Vector
An unauthenticated attacker sends crafted HTTP requests to the exposed command API endpoint over the network. Because no authentication check runs, the API executes privileged functions on behalf of the attacker. In deployments where myPRO Manager is reachable from operator networks, jump hosts, or the internet, exposure is direct. No verified public exploit is currently available. See the CISA advisory for technical details.
Detection Methods for CVE-2026-73807
Indicators of Compromise
- Unexpected HTTP requests to mySCADA myPRO Manager command API endpoints from unrecognized source addresses.
- Successful management API responses that are not correlated with an authenticated operator session.
- Configuration or project deployment changes in myPRO Manager without corresponding change-control records.
- Outbound connections from the myPRO Manager host to untrusted hosts following API access.
Detection Strategies
- Inspect web server and application logs for requests to privileged API paths that lack session or authentication headers.
- Correlate API activity with operator authentication events; flag privileged actions without a preceding successful login.
- Deploy network intrusion detection signatures for anomalous HTTP requests targeting myPRO Manager service ports.
- Baseline normal management API usage patterns and alert on off-hours or high-volume administrative calls.
Monitoring Recommendations
- Forward myPRO Manager application, access, and audit logs to a centralized Security Information and Event Management (SIEM) system for retention and correlation.
- Monitor east-west traffic between operator workstations and the myPRO Manager host for unauthorized sources.
- Enable file integrity monitoring on myPRO Manager project and configuration directories.
- Track process execution and network connections on the underlying host to identify post-exploitation activity.
How to Mitigate CVE-2026-73807
Immediate Actions Required
- Apply the vendor update from the mySCADA Download Page as identified in CISA ICS Advisory ICSA-26-258-03.
- Restrict network access to the myPRO Manager command API so it is reachable only from trusted engineering workstations.
- Audit recent API access and configuration changes for unauthorized activity.
- Rotate credentials, API tokens, and any secrets stored within myPRO Manager after patching.
Patch Information
mySCADA has published updated myPRO Manager builds addressing the missing authentication issue. Download the fixed version from the mySCADA Download Page and follow the guidance in CISA ICS Advisory ICSA-26-258-03 for validated versions and upgrade steps. Review the CSAF advisory for machine-readable remediation metadata.
Workarounds
- Place myPRO Manager behind a firewall or Virtual Private Network (VPN) and block command API ports from untrusted networks, per CISA ICS defense-in-depth guidance.
- Segment the SCADA management network from business networks and the internet.
- Enforce access control lists on network appliances to permit management API traffic only from authorized engineering hosts.
- Disable or firewall the affected API endpoint until the patch is applied where operationally feasible.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
