CVE-2026-14165 Overview
CVE-2026-14165 is an Authorization Bypass Through User-Controlled Key vulnerability [CWE-639] affecting Tuleap Enterprise Edition versions 17.0 through 17.5. The flaw allows an unauthenticated remote attacker to access data belonging to other users without proper authorization checks. The vulnerability is exploitable over the network with low attack complexity and requires no user interaction. Successful exploitation results in unauthorized disclosure of sensitive information stored within the affected Tuleap deployment.
Critical Impact
An attacker can retrieve data belonging to other Tuleap users by manipulating user-controlled identifiers, leading to confidentiality loss across the platform.
Affected Products
- Tuleap Enterprise Edition 17.0
- Tuleap Enterprise Edition versions 17.1 through 17.4
- Tuleap Enterprise Edition 17.5
Discovery Timeline
- 2026-07-13 - CVE-2026-14165 published to NVD
- 2026-07-13 - Last updated in NVD database
Technical Details for CVE-2026-14165
Vulnerability Analysis
The vulnerability stems from an Insecure Direct Object Reference (IDOR) pattern in Tuleap Enterprise Edition. The application accepts a user-controlled key, such as a resource identifier or object ID, without verifying that the requesting user has authorization to access the referenced object. This allows attackers to enumerate or specify identifiers belonging to other users and retrieve their data. The issue affects Tuleap Enterprise Edition versions 17.0 through 17.5.
The attack requires no authentication and no user interaction. According to the CVSS vector, only confidentiality is affected. Data integrity and availability remain intact. The vulnerability has an EPSS probability of 0.246%, placing it in the 15.97 percentile for likelihood of exploitation.
Root Cause
The root cause is missing authorization validation on requests that reference resources by user-supplied identifiers. Tuleap performs the requested operation based on the supplied key without confirming ownership or access permissions for the authenticated session. This maps to [CWE-639]: Authorization Bypass Through User-Controlled Key.
Attack Vector
An attacker sends crafted HTTP requests to Tuleap endpoints that accept resource identifiers as parameters. By substituting the identifier with values belonging to other users, the attacker receives the target's data in the response. No credentials or prior interaction with the victim are required. Refer to the 3DS Security Advisory CVE-2026-14165 for vendor technical details.
Detection Methods for CVE-2026-14165
Indicators of Compromise
- Unusual patterns of sequential or enumerated resource identifiers in HTTP request logs targeting Tuleap endpoints.
- Requests from a single source IP accessing resources associated with multiple distinct user accounts within short timeframes.
- Anomalous response sizes or 200 OK responses for resources that should return 403 Forbidden.
Detection Strategies
- Deploy web application firewall (WAF) rules to flag requests where the referenced object identifier does not correlate with the authenticated session context.
- Analyze Tuleap application logs for high-volume identifier iteration patterns typical of IDOR enumeration.
- Correlate authentication logs with resource access logs to detect access to objects outside a user's assigned scope.
Monitoring Recommendations
- Enable verbose access logging on Tuleap endpoints that accept user, project, or artifact identifiers as parameters.
- Establish baselines for per-user object access volumes and alert on statistical outliers.
- Forward Tuleap logs to a centralized SIEM for correlation with network telemetry and identity events.
How to Mitigate CVE-2026-14165
Immediate Actions Required
- Identify all Tuleap Enterprise Edition deployments running versions 17.0 through 17.5 and prioritize them for patching.
- Restrict network access to Tuleap instances to trusted networks or VPN clients until a patched release is deployed.
- Review Tuleap access logs from 2026-07-13 onward for signs of unauthorized data enumeration.
Patch Information
Consult the 3DS Security Advisory CVE-2026-14165 for the fixed release version and upgrade guidance from the vendor. Apply the vendor-supplied update as soon as it becomes available in your change management window.
Workarounds
- Place Tuleap behind an authenticating reverse proxy that enforces per-user session validation on resource endpoints.
- Apply WAF rules that block requests attempting to access identifiers outside the authenticated user's known scope.
- Reduce the exposure surface by disabling anonymous access and requiring authentication for all Tuleap API endpoints where feasible.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
