CVE-2014-2393 in AppSuite
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Open-Xchange AppSuite 7.4.1 before 7.4.1-rev11 and 7.4.2 before 7.4.2-rev13 allows remote attackers to inject arbitrary web script or HTML via a Drive filename that is not properly handled during use of the composer to add an e-mail attachment.
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Analysis
by VulDB Data Team • 05/11/2026
The CVE-2014-2393 vulnerability represents a critical cross-site scripting flaw in Open-Xchange AppSuite versions 7.4.1 before 7.4.1-rev11 and 7.4.2 before 7.4.2-rev13, demonstrating a fundamental weakness in input validation and output encoding mechanisms. This vulnerability specifically targets the email composition functionality where users can attach files from the integrated Drive service, creating a pathway for malicious actors to execute arbitrary web scripts within the context of other users' browsers. The flaw stems from inadequate sanitization of filenames when these attachments are processed during email composition, allowing attackers to craft malicious filenames that contain embedded script code.
The technical exploitation of this vulnerability occurs through a carefully crafted filename that includes malicious script content, which when processed by the email composer component fails to properly escape or encode the input before rendering it in the web interface. This improper handling creates an environment where the browser interprets the malicious content as legitimate script code rather than plain text, enabling attackers to execute scripts in the context of the victim's session. The vulnerability is classified as a classic reflected XSS attack vector, where the malicious payload is delivered through the email attachment mechanism and executed when the victim views the email or interacts with the attachment preview functionality.
From an operational impact perspective, this vulnerability presents significant risks to organizations relying on Open-Xchange AppSuite for email and collaboration services. An attacker could leverage this flaw to steal session cookies, perform unauthorized actions on behalf of users, redirect victims to malicious sites, or harvest sensitive information from the compromised sessions. The attack requires minimal privileges and can be executed remotely, making it particularly dangerous in enterprise environments where users frequently interact with email attachments from unknown sources. The vulnerability essentially undermines the security boundaries of the application, allowing attackers to escalate their privileges and access sensitive data within the context of authenticated user sessions.
The security implications extend beyond simple script execution, as this vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws in web applications. The ATT&CK framework categorizes this as a technique for code injection and privilege escalation, potentially enabling attackers to establish persistent access through session hijacking or credential theft. Organizations should implement immediate mitigations including updating to the patched versions of Open-Xchange AppSuite, implementing proper input validation and output encoding mechanisms, and deploying web application firewalls to detect and block malicious payloads. Additionally, user education about suspicious email attachments and the implementation of content security policies can help reduce the attack surface and prevent successful exploitation of this vulnerability.