CVE-2026-27480
MEDIUM
GHSA-qhp6-635j-x7r2
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Lifecycle Timeline
4Description
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.
Analysis
Static Web Server versions up to 2.40.1 contains a vulnerability that allows attackers to identify valid users by exploiting early responses for invalid usernames, enabli (CVSS 5.3).
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Remediation
Within 30 days: Identify affected systems running versions 2.1.0 and apply vendor patches as part of regular patch cycle. Vendor patch is available.
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External POC / Exploit Code
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