Description

An OS Command Injection vulnerability affecting Tuleap Enterprise Edition from 17.3 through 17.5 could allow an attacker to execute arbitrary commands on the server.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "8.8",
  "pubDate": "2026-09-21T13:17:10.830Z",
  "pubdate": "2026-09-21T13:17:10.830Z",
  "executiveSummary": "Tuleap Enterprise Edition versions 17.3 through 17.5 are susceptible to an OS Command Injection vulnerability. This flaw enables unauthenticated or authenticated attackers—depending on the specific entry point—to execute arbitrary system commands with the privileges of the underlying web server process. By injecting malicious payloads into vulnerable input vectors, an attacker can bypass application-level security controls to gain remote code execution capabilities. The risk is critical, as successful exploitation permits full server compromise, data exfiltration, and lateral movement within the hosting infrastructure. Remediation requires immediate application of vendor-supplied security patches or updates to address the underlying input sanitization failures.",
  "technicalDetails": "The vulnerability resides in the improper neutralization of special elements used in OS commands within Tuleap Enterprise Edition. The root cause is an inadequate validation or filtering mechanism applied to user-supplied input before it is processed by backend system-level execution functions. Specifically, the application fails to enforce strict boundaries on input passed to shell-executing routines, allowing the insertion of shell metacharacters such as backticks, semicolons, or pipe operators.\nExploitation involves crafting a malicious payload containing system commands and injecting it into an affected input parameter or API endpoint. When the Tuleap application processes this input, the vulnerable component passes the unsanitized string directly to the host operating system's command shell (e.g., /bin/sh or cmd.exe). This leads to the execution of the injected instructions within the context of the web server service account.\nThe attack flow follows a predictable sequence: First, an attacker identifies an endpoint that interfaces with system-level utilities. Second, the attacker submits a specially crafted HTTP request where parameters are modified to include shell injection syntax. Third, the application's interpreter executes the injected payload alongside or in place of the intended legitimate command. The payload behavior may include spawning reverse shells, downloading malicious binaries, or enumerating local system configurations.\nAffected versions include Tuleap Enterprise Edition 17.3, 17.4, and 17.5. The impact of successful exploitation is total system compromise, as the attacker gains the ability to execute arbitrary code. This bypasses typical authentication and authorization constraints, enabling persistence, privilege escalation, or access to sensitive project data and configuration files stored on the server. Because the execution occurs server-side, the vulnerability is generally exposed to the network segment where the Tuleap instance is accessible."
}