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Vulnerability record · CVE-2026-25736 · published 25 February 2026

CVE-2026-25736: Cern rucio cross-site scripting vulnerability

Cern · Rucio

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 RSE Attribute 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.

4.8 CVSS 3.1 Medium EPSS 0.46% · top 62.7% CWE-79 · Cross-site scriptingCWE-1004 · CWE-1004
4.8CVSS 3.1 base score
0.46%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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 Custom RSE Attribute 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.

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://cheatsheetseries.owasp.org/cheatsheets/Cross_Site_Scripting_Prevention_Cheat_Sheet.html Not Applicable
https://github.com/rucio/rucio/releases/tag/35.8.3 ProductRelease Notes
https://github.com/rucio/rucio/releases/tag/38.5.4 ProductRelease Notes
https://github.com/rucio/rucio/releases/tag/39.3.1 ProductRelease Notes
https://github.com/rucio/rucio/security/advisories/GHSA-fq4f-4738-rqxm ExploitVendor Advisory
https://github.com/rucio/rucio/security/advisories/GHSA-fq4f-4738-rqxm ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-25736), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.