How serious is CVE-2026-27480?

This vulnerability has a CVSS score of 5.3 out of 10, classified as MEDIUM severity. Proof-of-concept exploit code is publicly available, making this an active threat.

Is there exploit code available for CVE-2026-27480?

Yes, proof-of-concept exploit code for CVE-2026-27480 is publicly available on GitHub and security research platforms. This increases the risk of active exploitation.

Which products are affected by CVE-2026-27480?

CVE-2026-27480 affects static-web-server static web server. Check the full CVE details for specific version information.

How do I fix CVE-2026-27480?

To remediate CVE-2026-27480, check for security patches from static-web-server. Apply all available updates and security patches. If no patch is available, implement recommended workarounds or security controls to mitigate the risk.

CVE-2026-27480

Medium

|5.3

Exploit Available

Plain English Summary

AI-powered analysis for quick understanding

This vulnerability allows attackers to discover valid usernames by measuring how long the server takes to respond to login attempts; valid usernames take longer due to additional processing. It affects versions 2.1.0 through 2.40.1 of the static web server, and attackers can exploit this by trying different usernames to see which ones are valid before attempting to guess passwords.

Technical 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 Vector Analysis

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

Confidentiality ImpactLow

Integrity ImpactNone

Availability ImpactNone

ScopeUnchanged

Vector String

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Exploit Resources

Search for proof-of-concept code and exploit modules

GitHub Search Exploit-DB Nuclei Templates Metasploit Vulners

Official References

NIST NVD

Est. Bounty

$724($500-$1K)

Vendor Response

Grade APatched in 3 days

Quick Information

Published

Feb 21, 2026

about 2 months ago

Last Modified

Feb 24, 2026

about 1 month ago

Vendor

static-web-server

Product

static web server