CVE-2006-0663 in Lotus Domino iNotes Client
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in Lotus Domino iNotes Client 6.5.4 and 7.0 allow remote attackers to inject arbitrary web script or HTML via (1) an email subject; (2) an encoded javascript URI, as demonstrated using "java script:"; or (3) when the Domino Web Access ActiveX control is not installed, via an email attachment filename.
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Analysis
by VulDB Data Team • 05/22/2025
The vulnerability identified as CVE-2006-0663 represents a critical cross-site scripting flaw affecting IBM Lotus Domino iNotes Client versions 6.5.4 and 7.0. This vulnerability falls under the CWE-79 category of Cross-Site Scripting and specifically demonstrates how web application security can be compromised through improper input validation and sanitization. The issue arises within the email client's handling of various user-supplied inputs that are not adequately filtered or escaped before being rendered in web interfaces, creating opportunities for malicious actors to execute arbitrary code in the context of other users' browsers.
The technical exploitation of this vulnerability occurs through three distinct vectors that demonstrate the breadth of the attack surface. The first vector involves injection into email subject lines where attackers can embed malicious scripts that execute when recipients view their email messages. The second vector exploits encoded javascript URIs using techniques such as "java script:" which demonstrates how attackers can bypass simple input filtering mechanisms through character encoding obfuscation. The third vector targets environments where the Domino Web Access ActiveX control is not installed, allowing attackers to inject malicious content through email attachment filenames. These multiple attack vectors highlight the complexity of securing web applications and demonstrate how vulnerabilities can exist across different input handling mechanisms within the same application.
The operational impact of this vulnerability is significant as it enables remote attackers to execute arbitrary web scripts in the context of authenticated users' browsers. This creates potential for session hijacking, credential theft, and the execution of malicious actions on behalf of victims. The vulnerability particularly affects enterprise email systems where users may be less cautious about email attachments and subjects, and where the Domino Web Access ActiveX control is not consistently deployed across all client environments. Security analysts should note that this vulnerability aligns with ATT&CK technique T1566.001 for initial access through spearphishing attachments, and T1059.007 for command and scripting interpreter using javascript, making it a critical concern for organizations relying on Lotus Domino email infrastructure.
Organizations should implement immediate mitigations including input validation and sanitization of all user-supplied data, particularly email subjects and attachment names. The deployment of web application firewalls and content security policies can help prevent malicious script execution, while ensuring that the Domino Web Access ActiveX control is properly configured across all client systems. Regular security updates and patches should be applied to eliminate the vulnerability, and user education regarding suspicious email content should be emphasized. Additionally, implementing proper output encoding and context-aware escaping mechanisms for all dynamic content can prevent the execution of injected scripts. The vulnerability serves as a reminder of the importance of comprehensive input validation across all application interfaces and the necessity of following secure coding practices that prevent XSS vulnerabilities through proper sanitization and escaping techniques.