CVE-2026-105408 in Tuleap Enterprise Edition
Summary
by MITRE • 10/12/2026
A Stored Cross-site Scripting (XSS) vulnerability affecting Tuleap Enterprise Edition from 17.0 through 17.5 could allow an attacker to execute arbitrary script code in user's browser session.
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Analysis
by VulDB Data Team • 10/12/2026
The identified security flaw represents a classic instance of stored cross-site scripting, specifically categorized under CWE-79 within the Common Weakness Enumeration framework. This vulnerability impacts Tuleap Enterprise Edition versions ranging from 17.0 through 17.5 and stems from insufficient validation or sanitization of user-supplied input before it is persistently stored on the server side. Unlike reflected XSS, where malicious scripts are executed immediately via a crafted link, this flaw allows an attacker to embed harmful JavaScript code into data fields that are subsequently retrieved and rendered by other users' browsers without further modification. The persistence of the payload means that the vulnerability does not require active interaction with a specific exploit URL for each victim; instead, any user who views the compromised content becomes susceptible to execution of arbitrary scripts within their own session context.
From an operational perspective, this weakness poses significant risks to data integrity and confidentiality. An attacker can leverage this vector to perform actions on behalf of authenticated users, such as changing account settings, modifying project configurations, or stealing sensitive information like session cookies and authentication tokens. By injecting malicious JavaScript, the adversary can also redirect victims to phishing sites designed to harvest credentials or deploy further malware onto the user's system through drive-by downloads if browser security features are bypassed. The impact is particularly severe in collaborative environments managed by Tuleap, where trust between users is high and automated scripts may have elevated privileges depending on the context of the stored data.
The technical root cause typically involves a failure to properly encode special characters such as angle brackets, ampersands, or quotes when rendering user input in HTML contexts. This oversight allows the browser's parser to interpret injected script tags as executable code rather than static text. In many web applications, this occurs because developers rely on client-side validation which can be easily bypassed using proxy tools like Burp Suite, while server-side sanitization is either absent or implemented with insufficient coverage of all possible injection vectors and encoding contexts. The vulnerability persists in the database until explicitly removed by an administrator or through a data cleanup process, creating a long-term attack surface that affects every user accessing the tainted content.
Mitigation strategies must address both immediate remediation and long-term architectural improvements. For organizations currently running affected versions of Tuleap Enterprise Edition, applying the latest security patches provided by the vendor is the primary corrective action to eliminate this specific flaw in existing deployments. Beyond patching, developers should implement strict output encoding based on the context where data is rendered, ensuring that all special characters are converted into their corresponding HTML entities before being written to the DOM. Input validation alone is insufficient; defense-in-depth principles require combining robust server-side sanitization with Content Security Policy headers to restrict the sources from which scripts can be executed. Regular security audits and static code analysis tools configured to detect XSS patterns should also be integrated into the development lifecycle to prevent similar vulnerabilities in future releases.