Static Web Server: Timing-Based Username Enumeration in Basic Authentication_CVE-2026-27480

{
    "lastseen": "",
    "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.",
    "published": "2026-02-21T09:14:30.376Z",
    "modified": "2026-02-21T09:14:30.376Z",
    "type": "cve",
    "title": "Static Web Server: Timing-Based Username Enumeration in Basic Authentication",
    "source": "GitHub_M",
    "references": "https://github.com/static-web-server/static-web-server/security/advisories/GHSA-qhp6-635j-x7r2\nhttps://github.com/static-web-server/static-web-server/commit/7bf0fd425eb10dac9bf9ef5febce12c4dd039ce1",
    "id": "CVE-2026-27480",
    "bulletinFamily": "",
    "cwe": [
        "CWE-204"
    ],
    "cvelist": null,
    "sourceData": "static-web-server static-web-server >= 2.1.0, < 2.41.0",
    "sourceHref": "",
    "cvss": {
        "score": 5.3,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "static-web-server",
    "version": ">= 2.1.0, < 2.41.0",
    "vendor": "static-web-server",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}