CVE-2026-67165 in Connections
Summary
by MITRE • 10/13/2026
HCL Connections is vulnerable to a cross-site scripting attack where an attacker may leverage this issue to execute arbitrary script code in the browser of an unsuspecting user which leads to executing malicious script code. This may allow the attacker steal cookie-based authentication credentials and comprise user's account then launch other attacks.
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Analysis
by VulDB Data Team • 10/13/2026
The vulnerability identified within HCL Connections represents a classic cross-site scripting flaw, specifically categorized under CWE-79 in the Common Weakness Enumeration framework. This type of security defect arises when an application fails to properly validate, sanitize, or encode user-supplied input before including it in dynamic web content served to clients. In this specific instance, the lack of adequate output encoding allows malicious script code to be injected into pages that are subsequently viewed by other users. The core technical failure lies in the server-side processing logic which trusts client inputs without sufficient scrutiny, thereby enabling an attacker to embed executable JavaScript within legitimate-looking responses from the application.
From a tactical perspective, this vulnerability aligns with the ATT&CK technique of Client-Side Injection (T1059), where adversaries utilize scripts running on the victim's machine to achieve their objectives. The operational impact is severe because it bypasses same-origin policy protections that typically isolate web applications from each other. By leveraging this flaw, an attacker can execute arbitrary commands in the context of the vulnerable application, effectively gaining the trust and privileges associated with a legitimate user session. This capability transforms a simple data injection into a potent vector for account compromise, as the malicious scripts operate within the security boundary of the trusted domain hosting HCL Connections.
The primary consequence of this exploitation is the theft of sensitive information stored in browser cookies, such as authentication tokens or session identifiers. Once an attacker captures these credentials through script execution, they can impersonate the victim user without needing to know their password. This unauthorized access allows for further malicious activities including data exfiltration, modification of application settings, or using the compromised account to launch attacks against other users within the organization. The persistence of this threat is heightened by the fact that session cookies often remain valid for extended periods, providing a long window of opportunity for exploitation even after the initial injection has occurred.
Mitigation strategies must focus on both immediate remediation and long-term defensive posture improvements. Developers should implement strict input validation to reject or escape dangerous characters such as angle brackets, quotes, and ampersands before they are processed by the application logic. Furthermore, output encoding is critical; all user-supplied data rendered in HTML contexts must be encoded appropriately to ensure that browsers interpret it as text rather than executable code. Implementing Content Security Policy headers can also significantly reduce the impact of successful XSS attacks by restricting the sources from which scripts can be loaded and executed. Regular security testing using static analysis tools and dynamic vulnerability scanners is essential to identify such flaws early in the development lifecycle, ensuring that HCL Connections remains resilient against client-side injection threats.