{"answers":{"affected":"2 open source packages ship an affected version, including astro. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-50146 exists.","fix":"Upgrade astro to 6.3.3 or later.","what":"CVE-2026-50146 is a high-severity cross-site scripting vulnerability in withastro astro, published on 22 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-50146 and fix it if it is affected.\n\nWhat it is: CVE-2026-50146 is a high-severity cross-site scripting vulnerability in withastro astro, published on 22 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-50146 exists.\n\nAffected packages and fixed versions:\n- astro (npm): affected all versions; fixed in 6.3.3\n- astro (npm): affected all versions; fixed in 6.3.3\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-2026-50146/ (Markdown: https://insights.sbomify.com/CVE-2026-50146/index.md)","id":"CVE-2026-50146","markdown":"https://insights.sbomify.com/CVE-2026-50146/index.md","name":"CVE-2026-50146","record":{"aliases":["CLSA-2026-1784943142","CLSA-2026-1784943144","CLSA-2026-1784943177","CLSA-2026-1792160953","CLSA-2026-1792161557","CLSA-2026-1792161558","CLSA-2026-1792161698","CLSA-2026-1792161699","CLSA-2026-1792161700","CLSA-2026-1792161788","CLSA-2026-1792161856","GHSA-8hv8-536x-4wqp"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Astro web framework","requires_auth":"none","summary":"Attackers can inject arbitrary HTML via unescaped slot names in Astro components, leading to reflected XSS during server-side rendering.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"astro","vendor":"astro"}],"cvss":{"score":7.1,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-80","name":"Improper Neutralization of Script-Related HTML Tags in a Web Page"}],"description":"Astro is a web framework. Prior to 6.3.3, when a component uses a client:* directive, Astro inserts named slot content into a data-astro-template attribute without HTML escaping the slot name allowing an attacker to break out of the attribute context and inject arbitrary HTML, resulting in reflected XSS during SSR. This vulnerability is fixed in 6.3.3.","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"Astro: Reflected XSS via unescaped slot name","id":"CVE-2026-50146","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"xss","year":"2026"},"n_packages":2,"n_references":1,"next":{"headline":"Metabase: Arbitrary File Read via MySQL Connection Property Injection","id":"CVE-2026-50147"},"packages":[{"ecosystem":"npm","fixed":["6.3.3"],"introduced":["0"],"last_affected":[],"package":"astro","purl":null,"source":"GHSA-8hv8-536x-4wqp"},{"ecosystem":"npm","fixed":["6.3.3"],"introduced":["0"],"last_affected":[],"package":"astro","purl":"pkg:npm/astro","source":"GHSA-8hv8-536x-4wqp"}],"prev":{"headline":"ncnn: Out-of-bounds heap write in ParamDict::load_param via unchecked negative parameter id","id":"CVE-2026-50144"},"products":["astro"],"published":"2026-06-22","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 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":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-06-23","vendors":["withastro"]},"summary":"Attackers can inject arbitrary HTML via unescaped slot names in Astro components, leading to reflected XSS during server-side rendering.","url":"https://insights.sbomify.com/CVE-2026-50146/"}