CVE-2025-26997 is a high-severity reflected Cross-site Scripting (XSS) vulnerability identified in the validas Wireless Butler product, affecting versions up to 1.0.11. The vulnerability stems from improper neutralization of input during web page generation (CWE-79), allowing an attacker to inject malicious scripts into web pages viewed by other users. Specifically, because the input is not properly sanitized or encoded before being included in the HTML output, an attacker can craft a specially crafted URL or request that causes the victim's browser to execute arbitrary JavaScript code. This reflected XSS does not require prior authentication (PR:N) but does require user interaction (UI:R), such as clicking a malicious link. The vulnerability has a CVSS 3.1 base score of 7.1, reflecting its high impact on confidentiality, integrity, and availability, with network attack vector (AV:N), low attack complexity (AC:L), and scope change (S:C). Successful exploitation can lead to session hijacking, credential theft, unauthorized actions on behalf of the user, or delivery of further malware. Although no known exploits are currently reported in the wild, the vulnerability is publicly disclosed and could be targeted by attackers. The lack of an available patch at the time of disclosure increases the risk for affected deployments. Wireless Butler is a product by validas, likely used for wireless device management or related functions, and its web interface is the attack surface for this vulnerability.

For European organizations using validas Wireless Butler, this vulnerability poses a significant risk to the confidentiality and integrity of user sessions and data accessed through the product's web interface. Exploitation could allow attackers to hijack user sessions, steal sensitive information, or perform unauthorized actions within the Wireless Butler environment. This could lead to broader network compromise if Wireless Butler is integrated with other critical infrastructure or management systems. The reflected XSS nature means phishing or social engineering could be used to lure users into executing the malicious payload. Given the high CVSS score and scope change, the vulnerability could impact multiple users and systems within an organization. The absence of a patch means organizations must rely on mitigations to reduce exposure. The impact is particularly critical in sectors with stringent data protection requirements under GDPR, as exploitation could lead to data breaches and regulatory penalties. Additionally, if Wireless Butler is used in industrial, healthcare, or critical infrastructure environments in Europe, the operational disruption and data compromise risks are elevated.

1. Immediate mitigation should include implementing Web Application Firewall (WAF) rules to detect and block typical reflected XSS attack patterns targeting Wireless Butler's web interface. 2. Employ Content Security Policy (CSP) headers to restrict the execution of inline scripts and reduce the impact of injected scripts. 3. Educate users to avoid clicking suspicious links related to Wireless Butler and implement email filtering to reduce phishing attempts. 4. Network segmentation should be used to isolate Wireless Butler management interfaces from general user networks to limit exposure. 5. Monitor web server logs and network traffic for unusual requests or patterns indicative of attempted XSS exploitation. 6. Engage with validas to obtain timelines for official patches and apply them promptly once available. 7. If possible, disable or restrict access to the Wireless Butler web interface from untrusted networks until the vulnerability is remediated. 8. Review and harden input validation and output encoding practices in any custom integrations or extensions related to Wireless Butler.