CVE-2026-25138

low-risk
Published 2026-02-25

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.

Do I need to act?

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0.07% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.3/10 Medium
NETWORK / LOW complexity

Affected Products (1)

Rucio

Affected Vendors

Cern

References (6)

Not Applicable https://cheatsheetseries.owasp.org/cheatsheets/Authentication_Cheat_Sheet.html#a...
Product https://github.com/rucio/rucio/releases/tag/35.8.3
Product https://github.com/rucio/rucio/releases/tag/38.5.4
Product https://github.com/rucio/rucio/releases/tag/39.3.1
Exploit https://github.com/rucio/rucio/security/advisories/GHSA-38wq-6q2w-hcf9
Exploit https://github.com/rucio/rucio/security/advisories/GHSA-38wq-6q2w-hcf9
26
/ 100
low-risk
Severity 21/34 · High
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal