What’s Vulnerable › Vulnerabilities

CVE-2026-25734: Rucio WebUI has Stored Cross-site Scripting (XSS) in RSE Metadata

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-02-25 · updated 2026-06-17
• Weakness: CWE-79

Description

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.

Affected products

• rucio: before 35.8.3; from 36.0.0 before 38.5.4; from 39.0.0 before 39.3.1 — fixed in 35.8.3, 38.5.4, 39.3.1

How to fix

Upgrade to a fixed version: rucio 35.8.3, 38.5.4, 39.3.1. Check the vendor advisory for mitigations.

References

• https://cheatsheetseries.owasp.org/cheatsheets/Cross_Site_Scripting_Prevention_Cheat_Sheet.html
• https://github.com/rucio/rucio/releases/tag/35.8.3
• https://github.com/rucio/rucio/releases/tag/38.5.4
• https://github.com/rucio/rucio/releases/tag/39.3.1
• https://github.com/rucio/rucio/security/advisories/GHSA-h9fp-p2p9-873q
• https://github.com/rucio/rucio/security/advisories/GHSA-h9fp-p2p9-873q

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