{"cve":{"cve_id":"CVE-2025-66202","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.00273,"epss_percentile":0.18914,"epss_as_of":"2026-06-23","description":"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.","published_at":"2025-12-08T23:41:21.976000Z","last_modified_at":null,"cvss_v3_score":6.5,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","cvss_v3_severity":"MEDIUM","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-647"],"nvd_references":["https://github.com/withastro/astro/security/advisories/GHSA-whqg-ppgf-wp8c","https://github.com/withastro/astro/security/advisories/GHSA-ggxq-hp9w-j794","https://github.com/withastro/astro/commit/6f800813516b07bbe12c666a92937525fddb58ce"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:28:13.444760Z"},"effective_severity":"MEDIUM","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"L","value_label":"Low"},{"metric":"I","name":"Integrity","value":"L","value_label":"Low"},{"metric":"A","name":"Availability","value":"N","value_label":"None"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"withastro","vendor_name":"withastro","product_slug":"astro","product_name":"astro","version_start":"< 5.15.8","version_start_inclusive":true,"version_end":"< 5.15.8","version_end_inclusive":true,"cpe23_uri":"cve5:withastro:astro:< 5.15.8:< 5.15.8"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/withastro/astro/security/advisories/GHSA-whqg-ppgf-wp8c","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/withastro/astro/security/advisories/GHSA-ggxq-hp9w-j794","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/withastro/astro/commit/6f800813516b07bbe12c666a92937525fddb58ce","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2025-12-08T23:41:21.976000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:49:06.072201Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:49:06.072201Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:49:06.072201Z","label":"CVSS score revised","source":"cvelistv5"}]}