CVE-2026-75814 Overview
CVE-2026-75814 is a Cross-Site Request Forgery (CSRF) vulnerability affecting Ebyte devices. The device web management interface does not adequately verify the origin or authenticity of submitted requests. An unauthenticated remote attacker can craft a malicious page and persuade an authenticated administrator to visit it. Visiting the crafted page triggers unauthorized configuration changes or disrupts device availability. The weakness maps to CWE-352: Cross-Site Request Forgery and impacts operational technology (OT) environments per the associated CISA ICS advisory.
Critical Impact
Successful exploitation enables silent configuration tampering and denial of service against Ebyte industrial devices when an administrator is tricked into loading attacker-controlled content.
Affected Products
- Ebyte device with web management interface (specific model and firmware versions listed in the CISA ICS Advisory ICSA-26-237-06)
Discovery Timeline
- 2026-08-28 - CVE-2026-75814 published to NVD
- 2026-08-31 - Last updated in NVD database
Technical Details for CVE-2026-75814
Vulnerability Analysis
The flaw exists in the web management interface of the Ebyte device. The interface accepts state-changing HTTP requests without verifying that the request originated from a trusted, same-origin context. There is no anti-CSRF token, no strict Origin or Referer validation, and no re-authentication step guarding sensitive actions.
Because the browser automatically attaches session cookies to cross-origin requests, an authenticated administrator visiting an attacker-controlled page will unknowingly submit requests to the device. Those requests execute with full administrative authority. The attacker never needs credentials, network position inside the management VLAN, or user interaction beyond a single page visit.
Exploitation can alter device configuration, toggle network parameters, or invoke restart and factory-reset actions that disrupt device availability. In OT contexts, this can cascade into loss of view, loss of control, or process disruption.
Root Cause
The underlying defect is missing request-origin validation on state-changing endpoints. The application trusts ambient authentication (session cookies) as sole proof of intent, which is precisely the anti-pattern described by CWE-352.
Attack Vector
The attack vector is network based and requires administrator interaction. An attacker hosts a page containing auto-submitting forms or JavaScript-driven fetch calls targeting the device's management URL. When the administrator, already logged into the device in another tab, opens the malicious page, the browser issues authenticated requests to the device. No exploit code is required beyond standard HTML and JavaScript primitives. Refer to the CISA ICS Advisory and the CSAF advisory file for advisory-level technical details.
Detection Methods for CVE-2026-75814
Indicators of Compromise
- Unexpected configuration changes on Ebyte devices with no corresponding change-management ticket.
- Administrative HTTP POST or GET requests to the device management interface with Referer or Origin headers pointing to external, untrusted domains.
- Device reboots, factory resets, or availability drops correlated with administrator browsing activity.
Detection Strategies
- Inspect web server or proxy logs for state-changing requests to the Ebyte management interface where the Referer header is absent or off-origin.
- Correlate administrator workstation web browsing telemetry with configuration-change events on OT devices.
- Alert on administrative actions occurring outside sanctioned maintenance windows.
Monitoring Recommendations
- Forward device management access logs and OT network flow data to a centralized analytics platform for correlation.
- Baseline normal administrative sessions (source IP, user-agent, timing) and alert on deviations.
- Monitor phishing and watering-hole indicators targeting engineering and operations staff.
How to Mitigate CVE-2026-75814
Immediate Actions Required
- Isolate Ebyte device management interfaces on a dedicated management VLAN unreachable from general user networks and the internet.
- Require administrators to access the web management interface only from a hardened jump host with no general web browsing.
- Log out of the management interface immediately after each administrative session to invalidate the session cookie.
Patch Information
No vendor patch identifier is listed in the NVD entry at publication. Consult the CISA ICS Advisory ICSA-26-237-06 and the vendor for firmware updates addressing CVE-2026-75814, and apply them once available.
Workarounds
- Enforce network segmentation and firewall rules that block browser-originated traffic from reaching device management ports.
- Use a browser profile dedicated to device administration, with strict site isolation and no unrelated tabs open during sessions.
- Deploy a reverse proxy in front of the device that enforces Origin and Referer checks and injects anti-CSRF tokens where feasible.
- Disable remote management or restrict it to specific source IP allowlists until a fix is deployed.
# Example: restrict Ebyte device management access to a jump host only
# Replace <device_ip> and <jumphost_ip> with your values
iptables -A FORWARD -s <jumphost_ip> -d <device_ip> -p tcp --dport 80 -j ACCEPT
iptables -A FORWARD -s <jumphost_ip> -d <device_ip> -p tcp --dport 443 -j ACCEPT
iptables -A FORWARD -d <device_ip> -p tcp --dport 80 -j DROP
iptables -A FORWARD -d <device_ip> -p tcp --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
