CVE-2026-6953 in WebControl CMS
Summary
by MITRE • 06/30/2026
HTML injection vulnerability in Intermark IT's WebControl CMS v3.5. This vulnerability allows an attacker to send an email containing malicious HTML code to a victim via the contact form. To exploit this vulnerability, the attacker must send a request using the 'nombreApellidos', 'dirección ', and 'comentarios ' parameters to '/processContact.do'.
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Analysis
by VulDB Data Team • 06/30/2026
This html injection vulnerability in intermark it's webcontrol cms v3.5 represents a critical security flaw that undermines the integrity of user input validation mechanisms within the contact form processing functionality. The vulnerability stems from inadequate sanitization of user-supplied data when handling parameters such as 'nombreapellidos', 'dirección', and 'comentarios' through the '/processcontact.do' endpoint. According to cwe-79 common weakness enumeration, this classification encompasses situations where web applications fail to properly escape or validate html content, creating opportunities for malicious code execution. The flaw operates at the application layer where user inputs are directly incorporated into response pages without appropriate context-aware encoding or filtering mechanisms.
The operational impact of this vulnerability extends beyond simple cross-site scripting attacks as it provides attackers with potential pathways for more sophisticated exploitation techniques. When victims receive emails containing malicious html payloads, these payloads can be executed within the browser context of unsuspecting users who interact with the compromised application. This creates opportunities for session hijacking, credential theft, or redirection to malicious sites. The attack vector leverages the trust relationship between legitimate users and the web application, making it particularly dangerous in enterprise environments where users may have elevated privileges or access to sensitive data.
From an attacker's perspective this vulnerability aligns with several tactics described in the mitre att&ck framework under initial access and persistence categories. The ability to inject html through email contact forms represents a form of social engineering combined with technical exploitation, potentially enabling attackers to establish footholds within targeted organizations. The specific parameters mentioned indicate that the vulnerability affects user profile information fields, suggesting that even seemingly benign data collection mechanisms can become attack vectors for more serious security breaches. Organizations utilizing this cms version face heightened risk of data exfiltration and unauthorized access when proper input validation is not implemented.
Mitigation strategies should focus on comprehensive input sanitization and output encoding practices across all user-facing parameters within the webcontrol cms. Implementing strict html whitelist filtering, context-aware encoding for different output contexts, and regular security testing of form processing endpoints would significantly reduce exploitation risk. Additionally organizations should consider implementing content security policies to prevent execution of unauthorized scripts even if injection attempts occur. The vulnerability also highlights the importance of regular security updates and patch management processes to address known flaws in third-party cms solutions. Security teams must conduct thorough penetration testing of all form handling mechanisms to identify similar vulnerabilities across the entire application stack, as this represents a pattern that could exist in other input validation points within the system.