CVE-2012-6640 in Groupware
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Horde Internet Mail Program (IMP) before 5.0.22, as used in Horde Groupware Webmail Edition before 4.0.9, allows remote attackers to inject arbitrary web script or HTML via a crafted SVG image attachment, a different vulnerability than CVE-2012-5565.
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Analysis
by VulDB Data Team • 05/09/2026
The CVE-2012-6640 vulnerability represents a critical cross-site scripting flaw within the Horde Internet Mail Program IMP component, specifically affecting versions prior to 5.0.22 and the associated Horde Groupware Webmail Edition before 4.0.9. This vulnerability operates through a sophisticated attack vector that leverages SVG image attachments, demonstrating how seemingly benign file types can be weaponized to compromise web applications. The flaw exists in the email client's handling of multimedia content, particularly when processing vector graphics that contain embedded malicious scripts. This vulnerability is distinct from CVE-2012-5565, indicating that attackers can exploit different code paths to achieve similar malicious outcomes, highlighting the complexity of web application security in email systems.
The technical mechanism behind this vulnerability involves the improper sanitization of SVG image attachments within the email processing pipeline. When a user views an email containing a crafted SVG file, the application fails to adequately validate or escape the embedded script content, allowing malicious code to execute within the user's browser context. This occurs because the email client does not properly handle the XML-based structure of SVG files, which can contain script tags or other executable elements that bypass standard HTML sanitization routines. The vulnerability falls under CWE-79, which specifically addresses cross-site scripting flaws in web applications, and demonstrates how SVG processing can create unexpected attack surfaces. The flaw essentially allows attackers to inject arbitrary web script or HTML content that executes in the context of the victim's browser session, potentially leading to session hijacking, data theft, or further exploitation.
The operational impact of this vulnerability extends beyond simple script injection, creating significant risks for organizations relying on Horde-based email systems. Attackers can leverage this flaw to execute malicious code in the context of authenticated users, potentially gaining access to sensitive email content, personal information, or even escalating privileges within the webmail environment. The vulnerability is particularly dangerous because it can be delivered through routine email attachments, making it difficult for users to distinguish between legitimate and malicious content. This attack vector can be used in phishing campaigns where the malicious SVG attachment serves as a delivery mechanism for more sophisticated attacks, potentially bypassing traditional email security measures that focus on text-based content rather than embedded multimedia elements.
Organizations affected by this vulnerability should implement immediate mitigations including updating to the patched versions of IMP 5.0.22 and Horde Groupware Webmail Edition 4.0.9, which contain proper sanitization routines for SVG attachments. Additional protective measures include implementing strict content filtering policies that block or quarantine SVG files, deploying web application firewalls with enhanced XSS detection capabilities, and educating users about the risks of opening untrusted email attachments. From an ATT&CK framework perspective, this vulnerability maps to techniques involving command and control communications through webmail channels and credential access through session hijacking, emphasizing the need for layered security approaches. The vulnerability also highlights the importance of comprehensive input validation and the principle of least privilege in web application design, as proper sanitization of all user-supplied content, regardless of format, is essential for preventing such exploitation scenarios.