CVE-2026-6954 in WebControl CMS
Summary
by MITRE • 06/30/2026
Cross-Site Scripting (XSS) vulnerability in Intermark IT's WebControl CMS v3.5. This vulnerability allows an attacker to execute JavaScript code or inject a dynamic iframe into the victim’s browser by sending a malicious URL via the 'urlDestino' parameter in '/portal.do'. This vulnerability can be exploited to steal sensitive user data, such as session cookies, display phishing interfaces, or perform actions on the user’s behalf.
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Analysis
by VulDB Data Team • 06/30/2026
This cross-site scripting vulnerability exists within Intermark IT's WebControl CMS version 3.5 and represents a critical security flaw that enables arbitrary code execution through improper input validation. The vulnerability specifically manifests when the application fails to adequately sanitize user-supplied data passed through the 'urlDestino' parameter in the '/portal.do' endpoint. This oversight creates an opportunity for attackers to inject malicious JavaScript payloads or dynamic iframes directly into victim browsers, effectively bypassing normal security boundaries that protect against unauthorized code execution.
The technical exploitation of this vulnerability follows established patterns documented in CWE-79 - Improper Neutralization of Input During Web Page Generation and CWE-80 - Cross-Site Scripting Attacks. Attackers can craft malicious URLs containing encoded JavaScript payloads or iframe injection commands that get processed by the vulnerable application without proper sanitization. When legitimate users navigate to these crafted URLs, their browsers execute the injected code within the context of the trusted WebControl application, creating a dangerous privilege escalation scenario where attackers gain the ability to operate with the user's session privileges.
The operational impact of this vulnerability extends beyond simple data theft to encompass comprehensive session hijacking capabilities and user deception mechanisms. An attacker can leverage this vulnerability to steal session cookies and maintain persistent access to user accounts, effectively taking over user sessions without requiring authentication credentials. Additionally, the injection of dynamic iframes allows for sophisticated phishing attacks where victims are presented with convincing fraudulent interfaces that mimic legitimate application screens. This capability enables attackers to harvest additional sensitive information including login credentials, personal data, or financial details from unsuspecting users who believe they are interacting with legitimate application components.
From a threat modeling perspective, this vulnerability aligns with ATT&CK technique T1539 - Steal Web Session Cookie and T1071.001 - Application Layer Protocol: Web Protocols, demonstrating how attackers can establish persistent access through session manipulation and web-based exploitation techniques. The vulnerability's impact is particularly severe in environments where users have elevated privileges or access to sensitive data within the WebControl CMS framework, as it provides a direct pathway for privilege escalation attacks.
Mitigation strategies should prioritize immediate input validation and output encoding measures at the application level. Implementing proper parameter sanitization for all user-supplied inputs, particularly those used in URL construction or redirection logic, forms the primary defense mechanism against such attacks. The application should enforce strict validation of the 'urlDestino' parameter to ensure it conforms to expected formats and rejects any input containing potentially dangerous characters or script tags. Additionally, implementing Content Security Policy headers can provide an additional layer of protection by restricting the sources from which scripts can be loaded. Organizations should also consider deploying web application firewalls that can detect and block known malicious patterns in URL parameters, while regular security assessments and code reviews should be conducted to identify similar vulnerabilities across the application's attack surface.