CVE-2026-75548: Ebyte Device CSRF Vulnerability

CVE-2026-75548 Overview

CVE-2026-75548 is a clickjacking vulnerability affecting the Ebyte device web management interface. The interface does not restrict rendering within an external frame, exposing it to UI redress attacks [CWE-1021]. An unauthenticated remote attacker can craft a malicious webpage that overlays or embeds the management interface. When an authenticated administrator interacts with the crafted page, the attacker can trick them into initiating unintended configuration changes or disruptive actions. The vulnerability requires user interaction from an authenticated administrator to succeed.

Critical Impact
An unauthenticated remote attacker can leverage a crafted webpage to induce an authenticated administrator to perform unintended configuration changes on the Ebyte device, potentially disrupting industrial control operations.

Affected Products

Ebyte device web management interface (specific model and version details published in CISA ICS Advisory ICSA-26-237-06)
Deployed in Operational Technology (OT) and Industrial Control System (ICS) environments
Refer to the GitHub CSAF Document for the machine-readable product list

Discovery Timeline

2026-08-28 - CVE-2026-75548 published to NVD
2026-08-31 - Last updated in NVD database

Technical Details for CVE-2026-75548

Vulnerability Analysis

The Ebyte web management interface serves HTTP responses without directives that would block framing by third-party origins. The interface lacks an X-Frame-Options response header and does not enforce a Content Security Policy (CSP) frame-ancestors directive. This omission maps to [CWE-1021]: Improper Restriction of Rendered UI Layers or Frames.

An attacker hosts a malicious page that loads the target device interface inside an invisible iframe. The attacker then overlays deceptive UI elements aligned with sensitive controls in the framed interface. An authenticated administrator visiting the attacker page clicks what appears to be benign content but actually submits requests to the device.

Because the administrator holds an active session, the browser sends authenticated requests to the device. The attacker can drive configuration changes, trigger reboots, or disable protective settings.

Root Cause

The root cause is missing framing protection on HTTP responses served by the device web interface. The application does not set X-Frame-Options: DENY or SAMEORIGIN, nor does it emit a CSP frame-ancestors directive. Any origin can therefore embed the interface in a frame.

Attack Vector

The attack vector is network-based and requires no privileges on the target device. The attacker must convince an authenticated administrator to visit a controlled webpage. Delivery typically occurs through phishing links, watering-hole compromises, or malicious advertising. Exploitation depends on the administrator holding a valid session in another tab or window.

No verified code examples are available for this vulnerability. See the CISA ICS Advisory ICSA-26-237-06 for advisory-level technical detail.

Detection Methods for CVE-2026-75548

Indicators of Compromise

Administrator browser sessions loading the Ebyte management interface from referrers outside the device management network.
Configuration changes on Ebyte devices with no corresponding administrator activity in access logs.
Unexpected device reboots, service disruptions, or setting resets shortly after administrators browse external websites.

Detection Strategies

Inspect HTTP responses from the device interface for absence of X-Frame-Options and CSP frame-ancestors headers.
Correlate device configuration-change events with web proxy logs to identify off-network referrers preceding changes.
Deploy web filtering to flag pages that embed internal management IP ranges within iframes.

Monitoring Recommendations

Forward device audit logs and administrator browser telemetry to a centralized analytics platform for correlation.
Alert on administrator workstations accessing the OT management interface from non-approved workflows or origins.
Monitor for anomalous configuration writes to Ebyte devices outside change-management windows.

How to Mitigate CVE-2026-75548

Immediate Actions Required

Restrict management interface access to a dedicated administrative VLAN or jump host, isolated from general internet browsing.
Require administrators to use a hardened, dedicated browser profile with no concurrent internet sessions when managing Ebyte devices.
Enforce session timeouts and require re-authentication before sensitive configuration changes.
Apply vendor firmware updates as soon as they are published in CISA ICS Advisory ICSA-26-237-06.

Patch Information

At the time of publication, refer to CISA ICS Advisory ICSA-26-237-06 and the associated GitHub CSAF Document for vendor remediation guidance and affected version ranges. Apply patched firmware from Ebyte when available.

Workarounds

Place the management interface behind a reverse proxy that injects X-Frame-Options: DENY and Content-Security-Policy: frame-ancestors 'none' on all responses.
Block outbound access from administrator workstations to untrusted domains while management sessions are active.
Disable remote administrative access and require on-site or VPN-restricted management until firmware is patched.

bash

# Example reverse proxy header injection (NGINX) to block framing
add_header X-Frame-Options "DENY" always;
add_header Content-Security-Policy "frame-ancestors 'none'" always;