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Description

Rucio is a software framework that provides functionality to organize, manage, and access large volumes of scientific data using customizable policies. Prior to versions 35.8.3, 38.5.4, and 39.3.1, the WebUI login endpoint returns distinct error messages depending on whether a supplied username exists, allowing unauthenticated attackers to enumerate valid usernames. Versions 35.8.3, 38.5.4, and 39.3.1 fix the issue.

PUBLISHED Reserved 2026-01-29 | Published 2026-02-25 | Updated 2026-02-26 | Assigner GitHub_M




MEDIUM: 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Problem types

CWE-204: Observable Response Discrepancy

Product status

< 35.8.3
affected

>= 36.0.0rc1, < 38.5.4
affected

>= 39.0.0rc1, < 39.3.1
affected

References

github.com/.../rucio/security/advisories/GHSA-38wq-6q2w-hcf9 exploit

github.com/.../rucio/security/advisories/GHSA-38wq-6q2w-hcf9

cheatsheetseries.owasp.org/...uthentication_Cheat_Sheet.html

github.com/rucio/rucio/releases/tag/35.8.3

github.com/rucio/rucio/releases/tag/38.5.4

github.com/rucio/rucio/releases/tag/39.3.1

cve.org (CVE-2026-25138)

nvd.nist.gov (CVE-2026-25138)

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