{"id":"CVE-2025-66202","sourceIdentifier":"security-advisories@github.com","published":"2025-12-09T00:15:48.977","lastModified":"2026-10-07T20:10:01.970","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"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."},{"lang":"es","value":"Astro es un web framework. Las versiones 5.15.7 e inferiores tienen un bypass de doble codificación de URL que permite a cualquier atacante no autenticado omitir las comprobaciones de autenticación basadas en rutas en el middleware de Astro, otorgando acceso no autorizado a rutas protegidas. Aunque el CVE-2025-64765 original fue corregido en la v5.15.8, la corrección es insuficiente ya que solo decodifica una vez. Al usar URLs doblemente codificadas, los atacantes aún pueden omitir la autenticación y acceder a cualquier ruta protegida por las comprobaciones de nombre de ruta del middleware. Este problema está corregido en la versión 5.15.8."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"withastro","product":"astro","versions":[{"version":"< 5.15.8","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","baseScore":6.5,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":2.5},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","baseScore":6.5,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":2.5}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2025-12-09T14:18:21.955591Z","id":"CVE-2025-66202","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-647"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:astro:astro:*:*:*:*:*:node.js:*:*","versionEndExcluding":"5.15.8","matchCriteriaId":"1015DFA8-9106-453C-9144-11E63ADA3B67"}]}]}],"references":[{"url":"https://github.com/withastro/astro/commit/6f800813516b07bbe12c666a92937525fddb58ce","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/withastro/astro/security/advisories/GHSA-ggxq-hp9w-j794","source":"security-advisories@github.com","tags":["Not Applicable"]},{"url":"https://github.com/withastro/astro/security/advisories/GHSA-whqg-ppgf-wp8c","source":"security-advisories@github.com","tags":["Vendor Advisory"]}]}