CVE-2026-73422

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{"affected": [{"affectedData": [{"product": "astro", "vendor": "withastro", "versions": [{"status": "affected", "version": ">= 2.9.0, < 7.1.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Astro is a web framework for content-driven websites. From 2.9.0 until 7.1.0, Astro's server-side View Transition CSS generator interpolates animation properties into an inline style element without escaping them for CSS and HTML contexts. An attacker-controlled View Transition animation value such as duration can terminate the generated style element and inject arbitrary HTML or JavaScript. The affected code is packages/astro/src/runtime/server/transition.ts; renderTransition passes sheet.toString() into markHTMLString(), while addAnimationProperty serializes duration through toTimeValue() and also handles easing, direction, delay, fillMode, and name. Exploitation requires an on-demand or server-rendered route to pass attacker-controlled data into a View Transition animation definition and can execute arbitrary JavaScript in the affected application's origin, allowing access to sensitive page data and authenticated actions available to the victim. This issue is fixed in version 7.1.0."}, {"lang": "es", "value": "Astro es un framework web para sitios web basados en contenido. Desde la versi\u00f3n 2.9.0 hasta la 7.1.0, el generador CSS de View Transition del lado del servidor de Astro interpola propiedades de animaci\u00f3n en un elemento de estilo en l\u00ednea sin escaparlas para contextos CSS y HTML. Un valor de animaci\u00f3n de View Transition controlado por el atacante, como la duraci\u00f3n, puede terminar el elemento de estilo generado e inyectar HTML o JavaScript arbitrario. El c\u00f3digo afectado es packages/astro/src/runtime/server/transition.ts; renderTransition pasa sheet.toString() a markHTMLString(), mientras que addAnimationProperty serializa la duraci\u00f3n a trav\u00e9s de toTimeValue() y tambi\u00e9n maneja easing, direction, delay, fillMode y name. La explotaci\u00f3n requiere que una ruta bajo demya o renderizada por el servidor pase datos controlados por el atacante a una definici\u00f3n de animaci\u00f3n de View Transition y puede ejecutar JavaScript arbitrario en el origen de la aplicaci\u00f3n afectada, permitiendo el acceso a datos sensibles de la p\u00e1gina y acciones autenticadas disponibles para la v\u00edctima. Este problema est\u00e1 solucionado en la versi\u00f3n 7.1.0."}], "id": "CVE-2026-73422", "lastModified": "2026-10-24T15:10:00.190", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "LOW", "userInteraction": "PASSIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-73422", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-14T22:12:08.649209Z", "version": "2.0.3"}}]}, "published": "2026-08-12T21:17:41.187", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/withastro/astro/commit/092da560eea77ee63a3e2c583c80d8238544e42b"}, {"source": "security-advisories@github.com", "url": "https://github.com/withastro/astro/pull/17393"}, {"source": "security-advisories@github.com", "url": "https://github.com/withastro/astro/releases/tag/astro@7.1.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/withastro/astro/security/advisories/GHSA-4g3v-8h47-v7g6"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/withastro/astro/security/advisories/GHSA-4g3v-8h47-v7g6"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.9.0,7.1.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "astro", "source": "cna", "vendor": "withastro"}, "product": "astro", "vendor": "withastro"}], "created": "2026-08-12T21:30:07.725795+00:00", "updated": "2026-08-12T22:15:06.518848+00:00", "vendors": ["withastro", "withastro$PRODUCT$astro"]}