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CVE-2026-27480— Static Web Server: Timing-Based Username Enumeration in Basic Authentication

Quick assessment

Affected
static-web-server static-web-server
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.

Static Web Server是德国Static Web Server公司的一个静态 Web 服务器。 Static Web Server 2.1.0版本至2.40.1版本存在安全漏洞，该漏洞源于基本身份验证中存在基于时间的用户名枚举，可能导致暴力破解或凭据填充攻击。

CVSS 5.3 · Medium EPSS 0.47% · P40

Possible ATT&CK Techniques 1 AI

T1110.004 · Credential Stuffing
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I. Basic Information for CVE-2026-27480

Vulnerability Information
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Vulnerability Title
Static Web Server: Timing-Based Username Enumeration in Basic Authentication
Source: CVE Program / CVE List V5
Vulnerability Description
Static Web Server (SWS) is a production-ready web server suitable for static web files or assets. In versions 2.1.0 through 2.40.1, a timing-based username enumeration vulnerability in Basic Authentication allows attackers to identify valid users by exploiting early responses for invalid usernames, enabling targeted brute-force or credential-stuffing attacks. SWS checks whether a username exists before verifying the password, causing valid usernames to follow a slower code path (e.g., bcrypt hashing) while invalid usernames receive an immediate 401 response. This timing discrepancy allows attackers to enumerate valid accounts by measuring response-time differences. This issue has been fixed in version 2.41.0.
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
Static Web Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Static Web Server是德国Static Web Server公司的一个静态 Web 服务器。 Static Web Server 2.1.0版本至2.40.1版本存在安全漏洞，该漏洞源于基本身份验证中存在基于时间的用户名枚举，可能导致暴力破解或凭据填充攻击。
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
static-web-server static-web-server >= 2.1.0, < 2.41.0 -

II. Public POCs for CVE-2026-27480

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III. Intelligence Information for CVE-2026-27480

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IV. Related Vulnerabilities

Same product: static-web-server
Same vendor: static-web-server
Same weakness: CWE-204

V. Comments for CVE-2026-27480

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