{"answers":{"affected":"2 open source packages ship an affected version, including astro. It affects 1 product.","exploited":"There is no known exploitation of CVE-2025-66202 in the wild and no public exploit code.","fix":"Upgrade astro to 5.15.8 or later.","what":"CVE-2025-66202 is a medium-severity authentication bypass vulnerability in withastro astro, published on 8 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2025-66202 and fix it if it is affected.\n\nWhat it is: CVE-2025-66202 is a medium-severity authentication bypass vulnerability in withastro astro, published on 8 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2025-66202 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- astro (npm): affected all versions; fixed in 5.15.8\n- astro (npm): affected all versions; fixed in 5.15.8\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2025-66202/ (Markdown: https://insights.sbomify.com/CVE-2025-66202/index.md)","id":"CVE-2025-66202","markdown":"https://insights.sbomify.com/CVE-2025-66202/index.md","name":"CVE-2025-66202","record":{"aliases":["GHSA-whqg-ppgf-wp8c"],"analysis":{"component_type":"web_application","fix_type":"patch","impacts":["security_bypass","data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Astro web framework","requires_auth":"none","summary":"Unauthenticated attackers can bypass middleware authentication checks using double URL encoding to access protected routes in Astro applications.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"astro","vendor":"astro"}],"cvss":{"score":6.5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-647","name":"Use of Non-Canonical URL Paths for Authorization Decisions"}],"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.","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Astro has an Authentication Bypass via Double URL Encoding, a bypass for CVE-2025-64765","id":"CVE-2025-66202","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"auth_bypass","year":"2025"},"n_packages":2,"n_references":3,"next":{"headline":"StreamVault is Vulnerable to Authenticated Remote Code Execution (RCE) via ytdlpargs Configuration Injection","id":"CVE-2025-66203"},"packages":[{"ecosystem":"npm","fixed":["5.15.8"],"introduced":["0"],"last_affected":[],"package":"astro","purl":null,"source":"GHSA-whqg-ppgf-wp8c"},{"ecosystem":"npm","fixed":["5.15.8"],"introduced":["0"],"last_affected":[],"package":"astro","purl":"pkg:npm/astro","source":"GHSA-whqg-ppgf-wp8c"}],"prev":{"headline":"LibreChat is Vulnerable to Server-Side Request Forgery (SSRF) in Actions Capability","id":"CVE-2025-66201"},"products":["astro"],"published":"2025-12-08","related":[{"cvss_score":7.8,"headline":"Server source code is exposed to the public if sourcemaps are enabled","id":"CVE-2024-56159","kev_date_added":null,"published":"2024-12-19"},{"cvss_score":7.5,"headline":"Astro: Host header SSRF in prerendered error page fetch","id":"CVE-2026-54299","kev_date_added":null,"published":"2026-06-22"},{"cvss_score":7.2,"headline":"astro allows bypass of image proxy domain validation leading to SSRF and potential XSS","id":"CVE-2025-59837","kev_date_added":null,"published":"2025-10-28"},{"cvss_score":7.1,"headline":"Astro: Reflected XSS via unescaped slot name","id":"CVE-2026-50146","kev_date_added":null,"published":"2026-06-22"},{"cvss_score":7.1,"headline":"Astro is vulnerable to Reflected XSS via the server islands feature","id":"CVE-2025-64764","kev_date_added":null,"published":"2025-11-19"},{"cvss_score":6.9,"headline":"Astro middleware authentication checks based on url.pathname can be bypassed via url encoded values","id":"CVE-2025-64765","kev_date_added":null,"published":"2025-11-19"},{"cvss_score":6.9,"headline":"Unauthorized third-party images in Astro’s _image endpoint","id":"CVE-2025-55303","kev_date_added":null,"published":"2025-08-19"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2025-12-09","vendors":["withastro"]},"summary":"Unauthenticated attackers can bypass middleware authentication checks using double URL encoding to access protected routes in Astro applications.","url":"https://insights.sbomify.com/CVE-2025-66202/"}