CVE-2026-25138
Rucio WebUI has Username Enumeration via Login Error Message
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-204 |
| Vendor | rucio |
| Product | rucio |
| Published | Feb 25, 2026 |
| Last Updated | Feb 26, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Affected Versions
rucio / rucio
< 35.8.3 >= 36.0.0rc1, < 38.5.4 >= 39.0.0rc1, < 39.3.1
References
github.com: https://github.com/rucio/rucio/security/advisories/GHSA-38wq-6q2w-hcf9 cheatsheetseries.owasp.org: https://cheatsheetseries.owasp.org/cheatsheets/Authentication_Cheat_Sheet.html#authentication-and-error-messages github.com: https://github.com/rucio/rucio/releases/tag/35.8.3 github.com: https://github.com/rucio/rucio/releases/tag/38.5.4 github.com: https://github.com/rucio/rucio/releases/tag/39.3.1