{"id":"CVE-2026-59727","revision":"cdc37ab779ec451c969db270f2527154","records":[{"revision":"cdc37ab779ec451c969db270f2527154","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-59727","aliases":[],"title":"Astro: Cross-site scripting via unescaped transition:* directive values on hydrated islands","description":"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.","state":0,"publishedAt":"2026-07-27T19:42:32.222+00:00","modifiedAt":"2026-07-28T15:20:18.915+00:00","affected":[{"ecosystem":"Vendor product","name":"astro","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"withastro\",\n                    \"product\": \"astro\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 3.10.0, < 7.0.4\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":2.1,"severity":"LOW"}],"references":["https://github.com/withastro/astro/security/advisories/GHSA-7pw4-f3q4-r2p2","https://github.com/withastro/astro/pull/17212","https://github.com/withastro/astro/commit/7ba0bb1dc7516e88caff9abd7767322af44b0294","https://github.com/withastro/astro/releases/tag/astro@7.0.4"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-59727","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-59727","identifiers":["CVE-2026-59727"]},"retained":false,"historicalAffected":[]}],"coverage":[]}