CVE-2026-25138

Rucio WebUI has Username Enumeration via Login Error Message

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.

Affected

rucio

CVSS v3.1 GITHUB

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

EPSS

0.34% chance of exploitation in the next 30 days, 26th percentile

Published

2026-02-25

Updated

2026-02-26

Proof-of-concept exploits (1)

• advisories/GHSA-38wq-6q2w-hcf9

Security advisories

• rucio/rucio/security/advisories/GHSA-38wq-6q2w-hcf9
• rucio/rucio/releases/tag/35.8.3

References

• CVE Record
• NVD entry