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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Static-Web-Server | Static Web Server | >= 2.1.0, < 2.41.0 |
Related Weaknesses (CWE)
References
- https://github.com/static-web-server/static-web-server/commit/7bf0fd425eb10dac9bPatch
- https://github.com/static-web-server/static-web-server/security/advisories/GHSA-ExploitVendor Advisory
FAQ
What is CVE-2026-27480?
CVE-2026-27480 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 Authentic...
How severe is CVE-2026-27480?
CVE-2026-27480 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-27480?
Check the references section above for vendor advisories and patch information. Affected products include: Static-Web-Server Static Web Server.