CVE-2026-75813: Configuration Endpoint Auth Bypass Flaw

CVE-2026-75813 Overview

CVE-2026-75813 is a missing authorization vulnerability [CWE-862] affecting configuration endpoints on an industrial control system (ICS) device. The endpoints lack proper server-side authorization checks. Unauthorized network-based users can access or modify sensitive device settings without valid credentials. Successful exploitation can result in full compromise of device functionality. CISA published an ICS advisory tracking this issue as ICSA-26-237-06. The flaw is network-reachable and requires no privileges or user interaction, making it attractive to attackers who can reach the management plane of the affected device.

Critical Impact
Unauthenticated network attackers can modify sensitive device configuration, resulting in full compromise of device functionality.

Affected Products

Industrial control system device covered by CISA advisory ICSA-26-237-06
Vendor and model details: Not Available in NVD data at time of publication
Refer to the CISA ICS Advisory ICSA-26-237-06 for the authoritative product list

Discovery Timeline

2026-08-28 - CVE-2026-75813 published to NVD
2026-08-28 - Last updated in NVD database

Technical Details for CVE-2026-75813

Vulnerability Analysis

The vulnerability is a missing authorization weakness classified under [CWE-862]. Certain configuration endpoints on the affected device do not enforce server-side authorization checks before processing requests. A remote attacker who can reach these endpoints over the network can read or change sensitive settings that should be restricted to administrators.

Because the checks are missing on the server side, client-side controls such as hidden UI elements or role gates in a web console provide no protection. Attackers can craft direct HTTP requests to the vulnerable endpoints and bypass any front-end restrictions entirely.

The CVSS 4.0 vector indicates high impact to integrity of the vulnerable system, with no impact to confidentiality or availability of the vulnerable system itself. In practical terms, attackers can alter device configuration, which in industrial environments can cascade into process disruption, unsafe states, or persistent attacker footholds.

Root Cause

The root cause is an authorization gap on specific configuration endpoints. The endpoints accept and act on requests without validating whether the caller holds the required privilege. This is a classic broken access control pattern where authentication may be enforced elsewhere but authorization is not enforced consistently on every sensitive route.

Attack Vector

The attack vector is network-based. An attacker sends direct HTTP or protocol-level requests to the exposed configuration endpoints. No credentials, prior access, or user interaction are required. In ICS environments where management interfaces are reachable from operator networks or, worse, from IT networks or the internet, exposure is significant. Consult the CISA advisory and the CSAF advisory JSON for endpoint specifics as they are released.

Detection Methods for CVE-2026-75813

Indicators of Compromise

Unexpected configuration changes on ICS devices, especially outside change-management windows
HTTP requests to administrative or configuration endpoints originating from non-administrative hosts or subnets
New or modified device settings without a corresponding authenticated administrator session in device logs
Repeated probing of configuration URIs from a single source IP

Detection Strategies

Compare running device configurations against known-good baselines on a scheduled cadence and alert on drift
Inspect device and network logs for configuration-endpoint access that lacks a matching authenticated administrator session
Deploy network intrusion detection signatures for direct requests to configuration paths on the affected device family once CISA publishes endpoint details

Monitoring Recommendations

Forward device management-plane logs to a centralized SIEM for correlation across ICS assets
Alert on any write operation to device configuration performed outside approved maintenance windows
Monitor east-west traffic between IT and OT segments for unexpected connections to device management interfaces

How to Mitigate CVE-2026-75813

Immediate Actions Required

Restrict network access to device management and configuration interfaces using firewall rules or ACLs so only authorized engineering workstations can reach them
Place affected devices behind a segmented OT network and block direct exposure to enterprise or internet networks
Snapshot current device configurations to enable rapid detection of unauthorized changes and to support recovery
Review device access logs for unauthorized configuration reads or writes preceding patch deployment

Patch Information

The NVD entry does not list specific patched versions at the time of publication. Refer to the CISA ICS Advisory ICSA-26-237-06 and the corresponding CSAF JSON for vendor-supplied firmware updates and remediation guidance. Apply vendor patches as soon as they are available and validated in a test environment.

Workarounds

Enforce network segmentation between IT and OT per CISA ICS defense-in-depth guidance
Require VPN with multi-factor authentication for any remote access to the OT environment where affected devices reside
Disable or firewall off configuration endpoints from all sources except a small allowlist of engineering workstations
Increase logging verbosity on device management interfaces and forward logs to a centralized platform for review