Quick answers
- Is CVE-2026-105409 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-105409 being exploited in the wild.
- How severe is CVE-2026-105409?
- High severity, with a CVSS score of 8.7, published 12 October 2026.
- Which products and versions are affected?
- Dassault SystèMes Tuleap Enterprise Edition 17.0 through 17.5.
- Is there a fix for CVE-2026-105409?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-105409 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-105409?
- Check whether you run Dassault SystèMes Tuleap Enterprise Edition at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A stored XSS vulnerability exists in Tuleap Enterprise Edition versions 17.0–17.5, where unsanitized user input is persisted and rendered in user browsers without proper output encoding. An attacker with ability to inject content (such as through project descriptions, comments, or other stored fields) can execute arbitrary JavaScript in the context of other users' sessions, bypassing authentication and authorization controls.
Affected products
- Dassault Systèmes Tuleap Enterprise Edition 17.0 through 17.5
Timeline
- 2026-10-12: disclosed