CVE-2026-25733: Cern Rucio

Medium severity, CVSS 5.4. EPSS: 0.4% chance of exploitation in the next 30 days.

Rucio is a software framework that provides functionality to organize, manage, and access large volumes of scientific data using customizable policies. Versions prior to 35.8.3, 38.5.4, and 39.3.1 have a stored Cross-Site Scripting (XSS) vulnerability in the Custom Rules function of the WebUI where attacker-controlled input is persisted by the backend and later rendered in the WebUI without proper output encoding. This allows arbitrary JavaScript execution in the context of the WebUI for users who view affected pages, potentially enabling session token theft or unauthorized actions. Versions 35.8.3, 38.5.4, and 39.3.1 fix the issue.

Affected products

• Cern Rucio: before 35.8.3 (fixed in 35.8.3); from 36.0.0, before 38.5.4 (fixed in 38.5.4); from 39.0.0, before 39.3.1 (fixed in 39.3.1)

Published 2026-02-25. Last modified 2026-06-17.