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CVE-2026-25138— Rucio WebUI has Username Enumeration via Login Error Message

Quick assessment

Affected
rucio rucio
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Rucio是rucio开源的一个科学数据管理工具。 Rucio 35.8.3之前版本、38.5.4之前版本和39.3.1之前版本存在安全漏洞，该漏洞源于WebUI登录端点返回不同的错误消息，可能导致未经验证的攻击者枚举有效用户名。

CVSS 5.3 · Medium EPSS 0.34% · P26

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery
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I. Basic Information for CVE-2026-25138

Vulnerability Information
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Vulnerability Title
Rucio WebUI has Username Enumeration via Login Error Message
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
响应差异性信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Rucio 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Rucio是rucio开源的一个科学数据管理工具。 Rucio 35.8.3之前版本、38.5.4之前版本和39.3.1之前版本存在安全漏洞，该漏洞源于WebUI登录端点返回不同的错误消息，可能导致未经验证的攻击者枚举有效用户名。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
rucio rucio < 35.8.3 -

II. Public POCs for CVE-2026-25138

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III. Intelligence Information for CVE-2026-25138

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Vendor Advisories for CVE-2026-25138 (1)

Vendor Pages for CVE-2026-25138 (1)

Other References for CVE-2026-25138 (1)

Same Patch Batch · rucio · 2026-02-25 · 6 CVEs total

CVE-2026-25136 8.1 HIGH Rucio WebUI has a Reflected Cross-site Scripting Vulnerability
CVE-2026-25733 7.3 HIGH Rucio WebUI Vulnerable to Stored Cross-site Scripting (XSS) through Custom Rule Function
CVE-2026-25734 6.1 MEDIUM Rucio WebUI has Stored Cross-site Scripting (XSS) in RSE Metadata
CVE-2026-25735 6.1 MEDIUM Rucio WebUI has a Stored Cross-site Scripting (XSS) vulnerability its Identity Name
CVE-2026-25736 6.1 MEDIUM Rucio WebUI has a Stored Cross-site Scripting (XSS) Vulnerability in its Custom RSE Attrib

IV. Related Vulnerabilities

Same product: rucio
Same vendor: rucio
Same weakness: CWE-204

V. Comments for CVE-2026-25138

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