Astro has an Authentication Bypass via Double URL Encoding, a bypass for CVE-2025-64765_CVE-2025-66202

{
    "lastseen": "",
    "description": "Astro is a web framework. Versions 5.15.7 and below have a double URL encoding bypass which allows any unauthenticated attacker to bypass path-based authentication checks in Astro middleware, granting unauthorized access to protected routes. While the original CVE-2025-64765 was fixed in v5.15.8, the fix is insufficient as it only decodes once. By using double-encoded URLs, attackers can still bypass authentication and access any route protected by middleware pathname checks. This issue is fixed in version 5.15.8.",
    "published": "2025-12-08T23:41:21.976Z",
    "modified": "2025-12-08T23:41:21.976Z",
    "type": "cve",
    "title": "Astro has an Authentication Bypass via Double URL Encoding, a bypass for CVE-2025-64765",
    "source": "GitHub_M",
    "references": "https://github.com/withastro/astro/security/advisories/GHSA-whqg-ppgf-wp8c\nhttps://github.com/withastro/astro/security/advisories/GHSA-ggxq-hp9w-j794\nhttps://github.com/withastro/astro/commit/6f800813516b07bbe12c666a92937525fddb58ce",
    "id": "CVE-2025-66202",
    "bulletinFamily": "",
    "cwe": [
        "CWE-647"
    ],
    "cvelist": null,
    "sourceData": "withastro astro < 5.15.8",
    "sourceHref": "",
    "cvss": {
        "score": 6.5,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
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            "privilegesRequired": "",
            "userInteraction": "",
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            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "astro",
    "version": "< 5.15.8",
    "vendor": "withastro",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}