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Vulnerability · Published Feb 25, 2026 · Assigned by GitHub_M

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

Medium 6.1

In plain English

A medium-severity cross-site scripting in rucio from rucio. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.3%top 72.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
PyPIrucio-webui35.8.3GHSA-h9fp-p2p9-873q
PyPIrucio-webui38.5.4GHSA-h9fp-p2p9-873q
PyPIrucio-webui39.3.1GHSA-h9fp-p2p9-873q
PyPIrucio-webui35.8.3, 38.5.4, 39.3.1PYSEC-2026-3057

Affected products (as reported)

VendorProductVersions
rucio rucio < 35.8.3>= 36.0.0rc1, < 38.5.4>= 39.0.0rc1, < 39.3.1

Weakness: CWE-79, CWE-1004 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N

References