Skip to main content

Static Web Server CVE-2026-27480

MEDIUM
Observable Response Discrepancy (CWE-204)
2026-02-21 security-advisories@github.com GHSA-qhp6-635j-x7r2
Information Disclosure Static Web Server
5.3
CVSS 3.1 · GitHub Advisory
Share

Severity by source

GitHub Advisory PRIMARY
5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

4
Analysis Generated
Mar 12, 2026 - 22:04 vuln.today
PoC Detected
Feb 24, 2026 - 16:55 vuln.today
Public exploit code
Patch released
Feb 24, 2026 - 16:55 nvd
Patch available
CVE Published
Feb 21, 2026 - 10:16 nvd
MEDIUM 5.3

DescriptionGitHub Advisory

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.

AnalysisAI

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).

Unlock full vulnerability intelligence

  • Risk assessment & exploitation conditions
  • Attack chain visualization
  • Remediation with exact patch versions
  • Threat intelligence from 22 sources
  • Personal watchlist & email alerts
Continue with Google Continue with GitHub

Free forever · No credit card required

Vulnerability AssessmentAI

Risk Assessment CVSS 5.3 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker could exploit this vulnerability to identify valid users by exploiting early responses for invalid usernames, enabli.
Remediation A vendor patch is available — apply it immediately. … Detailed patch versions, workarounds, and compensating controls in full report.
Sign in to read full assessment

Recommended ActionAI

Within 30 days: Identify affected systems running versions 2.1.0 and apply vendor patches as part of regular patch cycle. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

Share

CVE-2026-27480 vulnerability details – vuln.today
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy