{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-59727","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-07-06T15:34:16.917Z","datePublished":"2026-07-27T19:42:32.222Z","dateUpdated":"2026-07-27T19:42:32.222Z"},"containers":{"cna":{"title":"Astro: Cross-site scripting via unescaped transition:* directive values on hydrated islands","problemTypes":[{"descriptions":[{"cweId":"CWE-79","lang":"en","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-83","lang":"en","description":"CWE-83: Improper Neutralization of Script in Attributes in a Web Page","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-116","lang":"en","description":"CWE-116: Improper Encoding or Escaping of Output","type":"CWE"}]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"ACTIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","subAvailabilityImpact":"NONE","baseScore":2.1,"baseSeverity":"LOW","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","version":"4.0"}}],"references":[{"name":"https://github.com/withastro/astro/security/advisories/GHSA-7pw4-f3q4-r2p2","tags":["x_refsource_CONFIRM"],"url":"https://github.com/withastro/astro/security/advisories/GHSA-7pw4-f3q4-r2p2"},{"name":"https://github.com/withastro/astro/pull/17212","tags":["x_refsource_MISC"],"url":"https://github.com/withastro/astro/pull/17212"},{"name":"https://github.com/withastro/astro/commit/7ba0bb1dc7516e88caff9abd7767322af44b0294","tags":["x_refsource_MISC"],"url":"https://github.com/withastro/astro/commit/7ba0bb1dc7516e88caff9abd7767322af44b0294"},{"name":"https://github.com/withastro/astro/releases/tag/astro@7.0.4","tags":["x_refsource_MISC"],"url":"https://github.com/withastro/astro/releases/tag/astro@7.0.4"}],"affected":[{"vendor":"withastro","product":"astro","versions":[{"version":">= 3.10.0, < 7.0.4","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-07-27T19:42:32.222Z"},"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."}],"source":{"advisory":"GHSA-7pw4-f3q4-r2p2","discovery":"UNKNOWN"}}}}