CVE-2026-1694 is a vulnerability classified under CWE-201 (Insertion of Sensitive Information into Sent Data) affecting arcinfo's PcVue software versions 12.0.0 through 16.3.3. PcVue is an industrial automation and SCADA software suite that includes web-based components such as WebVue, WebScheduler, TouchVue, and SnapVue. The vulnerability arises because the default configuration of IIS and ASP.net web servers adds HTTP headers that disclose sensitive server configuration details. These headers are not removed during the deployment phase of the affected PcVue web services, resulting in unnecessary exposure of internal server information to external users. This information leakage can provide attackers with reconnaissance data that may facilitate further targeted attacks. The vulnerability has a CVSS 4.0 base score of 2.3, reflecting its low severity. The attack vector is network-based and requires user interaction, with high attack complexity and no privileges required. There is no impact on confidentiality, integrity, or availability directly, and no known exploits have been reported in the wild. The lack of patch links suggests that mitigation relies on configuration changes rather than software updates. This issue highlights the importance of secure deployment practices, especially in industrial control system environments where PcVue is used.

The primary impact of CVE-2026-1694 is information disclosure that could aid attackers in gathering intelligence about the server environment hosting PcVue web services. While this does not directly compromise system confidentiality, integrity, or availability, it lowers the barrier for attackers to identify potential weaknesses or plan more sophisticated attacks. For organizations operating critical infrastructure or industrial control systems using PcVue, this exposure could increase the risk of targeted attacks or exploitation of other vulnerabilities. However, the overall risk is limited by the high complexity of exploitation and the requirement for user interaction. The vulnerability does not enable direct unauthorized access or control over systems. Therefore, the impact is mainly on the reconnaissance phase of an attack lifecycle, potentially facilitating future attacks if combined with other vulnerabilities or misconfigurations.

To mitigate CVE-2026-1694, organizations should implement the following specific actions: 1) Review and customize IIS and ASP.net server configurations to remove or suppress default HTTP headers that reveal sensitive server information before deploying PcVue web services. 2) Employ web application firewalls (WAFs) or reverse proxies that can filter or modify outgoing HTTP headers to prevent leakage. 3) Conduct thorough security assessments of PcVue deployments to identify and remediate information disclosure vectors. 4) Follow best practices for secure deployment of industrial control system web services, including disabling unnecessary features and minimizing exposed services. 5) Monitor network traffic for unusual requests that may indicate reconnaissance attempts. 6) Keep PcVue and underlying web server software up to date with security patches and vendor recommendations. 7) Educate administrators on the importance of removing default server headers and hardening web service configurations. Since no patches are currently linked, configuration hardening is the primary defense.