CVE-2026-1692 is a vulnerability classified under CWE-1385 (Missing Origin Validation) affecting arcinfo's PcVue software, specifically versions 12.0.0 through 16.3.3. The issue lies in the GraphicalData web services that support WebVue, WebScheduler, TouchVue, and SnapVue features. The vulnerability is due to the absence of proper origin validation in WebSocket connections on two endpoints: GraphicalData/js/signalR/connect and GraphicalData/js/signalR/reconnect. WebSockets are used for real-time communication between clients and servers, and origin validation is critical to ensure that only trusted sources can establish these connections. Without this validation, an attacker can craft a malicious website that tricks an authenticated PcVue user into initiating a WebSocket connection to the vulnerable endpoints. This could allow the attacker to perform actions or intercept data within the context of the authenticated session, potentially leading to unauthorized data access or manipulation. The CVSS 4.0 score of 5.3 reflects a medium severity, indicating that exploitation requires user interaction but no prior authentication, and impacts confidentiality and integrity to a limited extent. The vulnerability does not affect availability and has a low scope impact. No known exploits have been reported, and no official patches are currently available, though the vendor arcinfo has published the advisory. This vulnerability highlights the importance of validating the origin header in WebSocket handshake requests to prevent cross-origin attacks.

The primary impact of CVE-2026-1692 is the potential compromise of confidentiality and integrity within PcVue environments using the affected versions. An attacker can exploit this vulnerability by enticing an authenticated user to visit a malicious website, which then initiates unauthorized WebSocket connections to the vulnerable endpoints. This could lead to unauthorized data exposure or manipulation within the PcVue system, particularly affecting real-time data streams managed by the GraphicalData services. While the vulnerability does not allow direct remote code execution or system takeover, it can facilitate targeted attacks such as session hijacking or data tampering. Organizations relying on PcVue for industrial control, building management, or other critical infrastructure monitoring may face risks of data integrity loss or unauthorized information disclosure. The lack of authentication requirement for exploitation and the need for user interaction mean that social engineering or phishing campaigns could be effective attack vectors. The absence of known exploits reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits once the vulnerability details are widely known.

To mitigate CVE-2026-1692, organizations should implement the following specific measures: 1) Apply any forthcoming patches or updates from arcinfo as soon as they become available to address the missing origin validation. 2) If patches are not yet available, implement Web Application Firewall (WAF) rules to inspect and validate the Origin header in WebSocket handshake requests, blocking those from untrusted or unexpected origins. 3) Restrict access to the GraphicalData/js/signalR/connect and reconnect endpoints via network segmentation or access control lists to limit exposure to trusted networks and users only. 4) Educate users about the risks of interacting with untrusted websites, emphasizing caution with links and attachments that could trigger malicious WebSocket connections. 5) Monitor WebSocket traffic for unusual connection attempts or patterns indicative of exploitation attempts. 6) Consider deploying Content Security Policy (CSP) headers that restrict allowed origins for WebSocket connections in the PcVue web interfaces. 7) Review and harden authentication and session management controls to reduce the impact of any session-based attacks leveraging this vulnerability. These targeted mitigations go beyond generic advice by focusing on the specific vulnerable endpoints and the nature of the missing origin validation flaw.