{"id":"CVE-2026-59727","sourceIdentifier":"security-advisories@github.com","published":"2026-07-27T20:16:40.153","lastModified":"2026-10-24T13:10:00.147","vulnStatus":"Deferred","cveTags":[],"descriptions":[{"lang":"en","value":"Astro is a web framework for content-driven websites. In versions 3.10.0 through 7.0.3, when a transition:persist, transition:scope, or transition:persist-props directive is applied to a client-hydrated (client:*) component, Astro copied the directive value onto the rendered <astro-island> element without HTML-escaping it. If a developer reflects attacker-controlled input into one of these directives, an attacker can break out of the attribute and inject arbitrary HTML/JavaScript into the server-rendered output, resulting in reflected cross-site scripting (XSS). Exploitation requires the application developer to have written a non-idiomatic pattern — passing untrusted, request-derived input directly into a transition directive. Astro applications that do not route untrusted input into these directives are unaffected. This issue has been fixed in version 7.0.4."},{"lang":"es","value":"Astro es un framework web para sitios web basados en contenido. En las versiones 3.10.0 a 7.0.3, cuando una directiva transition:persist, transition:scope o transition:persist-props se aplica a un componente hidratado por el cliente (client:*), Astro copiaba el valor de la directiva en el elemento [astro-island] renderizado sin escapar el HTML. Si un desarrollador refleja entrada controlada por el atacante en una de estas directivas, un atacante puede salir del atributo e inyectar HTML/JavaScript arbitrario en la salida renderizada por el servidor, lo que resulta en cross-site scripting (XSS) reflejado. La explotación requiere que el desarrollador de la aplicación haya escrito un patrón no idiomático - pasando entrada no confiable, derivada de la solicitud, directamente a una directiva de transición. Las aplicaciones Astro que no dirigen entrada no confiable a estas directivas no se ven afectadas. Este problema ha sido solucionado en la versión 7.0.4."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"withastro","product":"astro","versions":[{"version":">= 3.10.0, < 7.0.4","status":"affected"}]}]}],"metrics":{"cvssMetricV40":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","baseScore":2.1,"baseSeverity":"LOW","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"ACTIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-07-28T15:08:17.872331Z","id":"CVE-2026-59727","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-79"},{"lang":"en","value":"CWE-83"},{"lang":"en","value":"CWE-116"}]}],"references":[{"url":"https://github.com/withastro/astro/commit/7ba0bb1dc7516e88caff9abd7767322af44b0294","source":"security-advisories@github.com"},{"url":"https://github.com/withastro/astro/pull/17212","source":"security-advisories@github.com"},{"url":"https://github.com/withastro/astro/releases/tag/astro@7.0.4","source":"security-advisories@github.com"},{"url":"https://github.com/withastro/astro/security/advisories/GHSA-7pw4-f3q4-r2p2","source":"security-advisories@github.com"},{"url":"https://github.com/withastro/astro/security/advisories/GHSA-7pw4-f3q4-r2p2","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}