CVE-2019-9592 in Connect ONSITE
Summary
by MITRE
A reflected Cross-site scripting (XSS) vulnerability in ShoreTel Connect ONSITE 19.45.1602.0 allows remote attackers to inject arbitrary web script or HTML via the url parameter.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 09/14/2025
The vulnerability identified as CVE-2019-9592 represents a critical reflected cross-site scripting flaw within ShoreTel Connect ONSITE version 19.45.1602.0, a unified communications platform widely deployed in enterprise environments for voice and video conferencing services. This vulnerability resides in the application's handling of user-supplied input through the url parameter, which fails to properly sanitize or validate incoming data before incorporating it into the web response. The flaw enables malicious actors to craft specially crafted URLs that, when executed by unsuspecting users, can execute arbitrary JavaScript code within the victim's browser context.
The technical implementation of this vulnerability follows the classic reflected XSS pattern where the malicious payload is embedded in a URL parameter and subsequently reflected back to the user without proper output encoding or validation. When a user clicks on a maliciously crafted link containing the XSS payload, the web application includes this unvalidated input directly into the HTML response, allowing the attacker's script to execute in the user's browser session. This creates a persistent threat vector that can be leveraged for session hijacking, credential theft, or redirection to malicious sites.
From an operational impact perspective, this vulnerability poses significant risks to organizations utilizing ShoreTel Connect ONSITE as it can be exploited remotely without requiring authentication or privileged access. Attackers can leverage this vulnerability to impersonate legitimate users, access sensitive communication data, or manipulate the web interface to perform unauthorized actions. The attack surface is particularly concerning given that ShoreTel systems are often integrated with corporate networks and may contain sensitive business communications. The vulnerability aligns with CWE-79 which specifically addresses Cross-site Scripting flaws in web applications, and can be mapped to ATT&CK technique T1566.001 for initial access through spearphishing with a link, making it a critical threat vector for social engineering campaigns.
The exploitation of this vulnerability requires minimal technical expertise and can be automated, making it particularly dangerous in enterprise environments where users may not be adequately trained to recognize malicious links. Organizations should consider implementing comprehensive input validation mechanisms, output encoding for all user-supplied data, and regular security assessments of their unified communications infrastructure. The vulnerability demonstrates the critical importance of maintaining up-to-date security patches and implementing defense-in-depth strategies that include web application firewalls, content security policies, and user education programs to mitigate the risk of such attacks.