{"answers":{"affected":"2 open source packages ship an affected version, including blitz.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-9520 exists.","fix":"No fix has been published for CVE-2026-9520 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-9520 is a medium-severity cross-site scripting vulnerability in blitz-js blitz, published on 26 May 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-2026-9520 and fix it if it is affected.\n\nWhat it is: CVE-2026-9520 is a medium-severity cross-site scripting vulnerability in blitz-js blitz, published on 26 May 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-2026-9520 exists.\n\nAffected packages and fixed versions:\n- blitz (npm): affected all versions up to 3.0.2; no fix listed\n- blitz (npm): affected all versions up to 3.0.2; no fix listed\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-2026-9520/ (Markdown: https://insights.sbomify.com/CVE-2026-9520/index.md)","id":"CVE-2026-9520","markdown":"https://insights.sbomify.com/CVE-2026-9520/index.md","name":"CVE-2026-9520","record":{"aliases":["GHSA-h2p9-cr4h-px24"],"analysis":{"component_type":"library","fix_type":"no_fix_stated","impacts":["code_execution","account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"Blitz.js framework","requires_auth":"none","summary":"Cross-site scripting in Blitz.js sign-in form allows remote attackers to inject scripts, potentially leading to session hijacking or code execution.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulDB","cpe":[],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P","version":"4.0"},"cwes":[{"id":"CWE-94","name":"Improper Control of Generation of Code"},{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"A weakness has been identified in blitz-js blitz up to 3.0.2 on GitHub. This impacts an unknown function of the file packages/generator/templates/app/src/app/auth/components/LoginForm.tsx of the component Sign-in. This manipulation of the argument Next causes cross site scripting. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":false,"headline":"blitz-js blitz Sign-in LoginForm.tsx cross site scripting","id":"CVE-2026-9520","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"xss","year":"2026"},"n_packages":2,"n_references":4,"next":{"headline":"fraillt bitsery std_smart_ptr.h loadFromSharedState improper validation of specified type of input","id":"CVE-2026-9521"},"packages":[{"ecosystem":"npm","fixed":[],"introduced":["0"],"last_affected":["3.0.2"],"package":"blitz","purl":null,"source":"GHSA-h2p9-cr4h-px24"},{"ecosystem":"npm","fixed":[],"introduced":["0"],"last_affected":["3.0.2"],"package":"blitz","purl":"pkg:npm/blitz","source":"GHSA-h2p9-cr4h-px24"}],"prev":{"headline":"stonith404 pingvin-share Sign-in Auto-Redirect signIn.tsx getServerSideProps cross site scripting","id":"CVE-2026-9519"},"products":["blitz"],"published":"2026-05-26","related":[],"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":"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":"2026-05-27","vendors":["blitz-js"]},"summary":"Cross-site scripting in Blitz.js sign-in form allows remote attackers to inject scripts, potentially leading to session hijacking or code execution.","url":"https://insights.sbomify.com/CVE-2026-9520/"}