What’s Vulnerable › Vulnerabilities

CVE-2026-25136: Rucio WebUI has a Reflected Cross-site Scripting Vulnerability

• Severity: medium (CVSS 6.1 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. A reflected Cross-site Scripting vulnerability was located in versions prior to 35.8.3, 38.5.4, and 39.3.1 in the rendering of the ExceptionMessage of the WebUI 500 error which could allow attackers to steal login session tokens of users who navigate to a specially crafted URL. 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-h79m-5jjm-jm4q

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