CVE-2025-3271 in Documentum Webtop
Summary
by MITRE • 09/09/2026
Documentum Webtop versions prior to 16.7.1 software is vulnerable to an XSS
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified in Documentum Webtop versions prior to 16.7.1 represents a significant security risk classified as Cross-Site Scripting, commonly referred to by the acronym XSS. This type of flaw falls under the category of CWE-79 Improper Neutralization of Input During Web Page Generation within the Common Weakness Enumeration framework. The core technical issue stems from insufficient validation or sanitization of user-supplied input before it is processed and rendered back into the web application interface. When a malicious actor crafts a specially designed request containing executable script code, such as JavaScript, the vulnerable version of Documentum Webtop fails to properly escape these characters. Consequently, when another user interacts with the affected system component or views content influenced by this input, the browser interprets and executes the injected scripts in the context of the trusted domain associated with the application.
From an operational perspective, the impact of this vulnerability is severe because it allows attackers to bypass standard web security policies like the Same-Origin Policy. This breach enables a wide range of malicious activities including session hijacking, where the attacker steals authentication cookies or tokens to impersonate legitimate users and gain unauthorized access to sensitive data or administrative functions. Additionally, the flaw can be leveraged for keylogging, defacement of the user interface, or redirecting victims to phishing sites designed to harvest credentials further down the line. Since Documentum is often used in enterprise environments for critical document management and collaboration, compromising a single session could potentially lead to broader network infiltration if lateral movement techniques are employed following initial access through XSS.
The exploitation vector typically involves social engineering tactics where an attacker tricks a privileged user into clicking a malicious link or submitting data via a form that triggers the vulnerable code path within Webtop. This aligns with several tactics in the MITRE ATT&CK framework, particularly T1059 Command and Scripting Interpreter for executing arbitrary commands if combined with other vulnerabilities, but more directly relates to T1189 Drive-by Compromise or T1204 User Execution depending on how the payload is delivered. The lack of robust input validation means that even seemingly innocuous fields can become vectors for attack if they are reflected in the HTML response without proper encoding.
To mitigate this risk, organizations running Documentum Webtop must prioritize immediate patching to version 16.7.1 or later where these input handling mechanisms have been corrected. In addition to applying vendor-provided updates, administrators should implement strict Content Security Policy headers that restrict script execution sources and disable inline scripts whenever possible. Input validation strategies should be reinforced at both the application layer using allow-lists for expected character sets and output encoding techniques such as HTML entity encoding to ensure special characters are rendered safely rather than executed. Regular security audits and penetration testing focused on injection flaws will further help identify any residual weaknesses in custom configurations or third-party integrations that might still expose similar vulnerabilities despite the core software update.