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CVE-2026-14165 – Authorization Bypass – Tuleap Enterprise Edition 17.0 through 17.5

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Summary

CVE-2026-14165 is a high-severity Authorization Bypass Through User-Controlled Key vulnerability (CWE-639) in Dassault Systèmes’ Tuleap Enterprise Edition, affecting versions 17.0 through 17.5. An unauthenticated remote attacker can exploit this flaw over the network — with no credentials or user interaction required — to access data belonging to other users without authorization. The vulnerability carries a CVSS v3.1 score of 7.5 (High) and was published on July 13, 2026.

Technical details

  • Root cause: The vulnerability is classified as CWE-639 (Authorization Bypass Through User-Controlled Key). The application relies on a key value that can be supplied or manipulated by an unauthenticated attacker to make authorization decisions, allowing access to resources owned by other users.
  • Trigger conditions: No authentication is required and no user interaction is needed. The attack complexity is low, making it straightforward to exploit.
  • Attack vector: Remotely exploitable over the network (AV:N) via the Tuleap web interface, accessible over HTTP/HTTPS.
  • Impact: High confidentiality impact — a successful attacker can read data belonging to other users. There is no impact on integrity or availability (CVSS: C:H/I:N/A:N).

Affected software

  • Tuleap Enterprise Edition versions 17.0 through 17.5 (inclusive), as published by Dassault Systèmes

Severity

CVSS v3.1 Base Score: 7.5 (High)
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Mitigation and recommended actions

  • Immediate: Organizations running Tuleap Enterprise Edition versions 17.0 through 17.5 should consult the Dassault Systèmes security advisory (linked in the references below) for the latest patching guidance and the specific remediated build version.
  • If immediate patching is not feasible: Restrict network access to the Tuleap instance to trusted IP ranges only using firewall rules or network segmentation. Monitor logs for anomalous cross-user data access patterns.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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