Rucio up to 35.8.2/38.5.3/39.3.0 cross site scripting

Summaryinfo

A vulnerability has been found in Rucio up to 35.8.2/38.5.3/39.3.0 and classified as problematic. The affected element is an unknown function. The manipulation leads to cross site scripting. This vulnerability is listed as CVE-2026-25734. The attack may be initiated remotely. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Rucio up to 35.8.2/38.5.3/39.3.0. It has been rated as problematic. This issue affects an unknown part. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. The summary by CVE is:

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 RSE metadata 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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-25734 since 02/05/2026. The exploitation is known to be easy. The attack may be initiated remotely. Additional levels of successful authentication are necessary for exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 35.8.3, 38.5.4 or 39.3.1 eliminates this vulnerability. The upgrade is hosted for download at github.com.

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Productinfo

Name

• Rucio

Version

• 35.8.0
• 35.8.1
• 35.8.2
• 38.5.0
• 38.5.1
• 38.5.2
• 38.5.3
• 39.0
• 39.1
• 39.2
• 39.3.0

Website

• Product: https://github.com/rucio/rucio/

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