CVE-2026-105407 Overview
CVE-2026-105407 is an OS Command Injection vulnerability [CWE-78] in Tuleap Enterprise Edition versions 17.0 through 17.5. An authenticated attacker can inject operating system commands that execute on the underlying server. Successful exploitation grants arbitrary command execution with the privileges of the Tuleap service account.
Tuleap is an open-source Application Lifecycle Management (ALM) platform used by engineering teams for source control, issue tracking, and continuous integration. Compromise of a Tuleap server exposes source code, build pipelines, and credentials stored in integrated tooling.
Critical Impact
Authenticated attackers can execute arbitrary OS commands on the Tuleap server, resulting in full confidentiality, integrity, and availability loss of the host and any secrets or source code it stores.
Affected Products
- Tuleap Enterprise Edition 17.0
- Tuleap Enterprise Edition versions between 17.1 and 17.4
- Tuleap Enterprise Edition 17.5
Discovery Timeline
- 2026-10-12 - CVE-2026-105407 published to NVD
- 2026-10-15 - Last updated in NVD database
Technical Details for CVE-2026-105407
Vulnerability Analysis
The vulnerability is classified under CWE-78, Improper Neutralization of Special Elements used in an OS Command. Tuleap passes attacker-controlled input into a shell or command interpreter without adequate neutralization of metacharacters. The attacker reaches the vulnerable code path over the network with low-privilege authenticated access and no user interaction.
Exploitation yields arbitrary command execution in the context of the Tuleap application user. From that foothold, an attacker can read repository data, extract CI/CD secrets, pivot into connected systems, and tamper with build artifacts. The relatively high EPSS percentile indicates meaningful real-world exploitation interest compared to the broader CVE population.
Root Cause
The root cause is improper neutralization of shell metacharacters in a server-side function that constructs an OS command from user-supplied input. When Tuleap concatenates untrusted input into a command string passed to a shell, characters such as ;, |, &, backticks, and $() break out of the intended argument context. The command interpreter then executes attacker-supplied payloads as additional commands.
Attack Vector
The attack vector is network-based and requires authenticated low-privilege access to a vulnerable Tuleap instance. An attacker submits a crafted request to the affected endpoint containing shell metacharacters within a parameter that reaches the vulnerable sink. The injected commands execute server-side as the Tuleap service account.
No verified public exploit code is available at the time of writing. Technical specifics are described in the 3DS Security Advisory for CVE-2026-105407.
Stop Remote Code Execution Before It Runs
Singularity™ Endpoint detects and blocks exploit attempts at machine speed, including zero-days and novel attack techniques.
Stop Exploit AttemptsDetection Methods for CVE-2026-105407
Indicators of Compromise
- Unexpected child processes spawned by the Tuleap PHP-FPM or web worker processes, especially sh, bash, curl, wget, nc, or python.
- Outbound network connections from the Tuleap server to unfamiliar hosts shortly after HTTP requests containing shell metacharacters.
- New or modified files under Tuleap data directories, web roots, or /tmp with recent timestamps.
- Authentication logs showing low-privilege accounts issuing requests to administrative or integration endpoints.
Detection Strategies
- Inspect web server access logs for parameters containing ;, |, &&, backticks, or $( targeting Tuleap endpoints.
- Alert on process lineage where the web server or PHP worker is the parent of a shell or scripting interpreter.
- Correlate authenticated session activity with host-level process execution events to flag command execution originating from web requests.
Monitoring Recommendations
- Enable verbose audit logging on the Tuleap application tier and forward logs to a central analytics platform.
- Baseline normal process trees for the Tuleap service account and alert on deviations.
- Monitor egress traffic from the Tuleap host for connections to non-approved destinations.
How to Mitigate CVE-2026-105407
Immediate Actions Required
- Upgrade Tuleap Enterprise Edition to a release above 17.5 that contains the vendor fix.
- Restrict network access to the Tuleap web interface to trusted users and management networks only.
- Rotate any credentials, API tokens, and SSH keys stored on or accessible from the Tuleap server.
- Review audit logs for suspicious authenticated activity against affected versions since deployment.
Patch Information
Enalean has published remediation guidance in the 3DS Security Advisory for CVE-2026-105407. Administrators should apply the fixed Tuleap Enterprise Edition release referenced in the advisory. Verify the installed version with the Tuleap administration interface after patching.
Workarounds
- Limit account provisioning so that only trusted users hold the low-privilege access required to reach the vulnerable endpoint.
- Place the Tuleap instance behind a web application firewall with rules that block shell metacharacters in request parameters.
- Run the Tuleap service under a minimally privileged account with restrictive filesystem and network permissions until patching is complete.
# Example WAF rule concept to block shell metacharacters in request parameters
# Adapt to your WAF syntax (ModSecurity shown)
SecRule ARGS "@rx [;|&`$(){}]" \
"id:1050407,phase:2,deny,status:403,log,\
msg:'Potential OS command injection against Tuleap (CVE-2026-105407)'"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
