{"answers":{"affected":"2 open source packages ship an affected version, including better-auth.","exploited":"There is no known exploitation of CVE-2025-71403 in the wild and no public exploit code.","fix":"Upgrade better-auth to 1.1.21 or later.","what":"CVE-2025-71403 is a high-severity vulnerability in better-auth, published on 1 Aug 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-2025-71403 and fix it if it is affected.\n\nWhat it is: CVE-2025-71403 is a high-severity vulnerability in better-auth, published on 1 Aug 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: There is no known exploitation of CVE-2025-71403 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- better-auth (npm): affected all versions; fixed in 1.1.21\n- better-auth (npm): affected all versions; fixed in 1.1.21\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-2025-71403/ (Markdown: https://insights.sbomify.com/CVE-2025-71403/index.md)","id":"CVE-2025-71403","markdown":"https://insights.sbomify.com/CVE-2025-71403/index.md","name":"CVE-2025-71403","record":{"aliases":["GHSA-g2jv-pgqw-qxhv","GHSA-vp58-j275-797x"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["account_takeover","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Authentication library","requires_auth":"none","summary":"Attackers can exploit a trustedOrigins validation bypass to perform open redirects, potentially stealing tokens and taking over user accounts.","user_interaction":"required","vuln_class":"open_redirect"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":7.1,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-601","name":"URL Redirection to Untrusted Site"}],"description":"better-auth versions before 1.1.20 contain a bypass vulnerability in trustedOrigins validation logic affecting absolute URLs and wildcard domains. Attackers can construct malicious callbackURL parameters that pass origin checks and trigger open redirects to steal sensitive tokens for account takeover.","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":false,"headline":"better-auth before 1.1.20 Open Redirect via trustedOrigins Bypass","id":"CVE-2025-71403","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"open_redirect","year":"2025"},"n_packages":2,"n_references":2,"next":{"headline":"better-auth before 1.1.16 Reflected XSS via error parameter","id":"CVE-2025-71404"},"packages":[{"ecosystem":"npm","fixed":["1.1.21"],"introduced":["0"],"last_affected":[],"package":"better-auth","purl":null,"source":"GHSA-vp58-j275-797x"},{"ecosystem":"npm","fixed":["1.1.21"],"introduced":["0"],"last_affected":[],"package":"better-auth","purl":"pkg:npm/better-auth","source":"GHSA-vp58-j275-797x"}],"prev":{"headline":"better-auth before 1.4.0 Session Revocation via Forged Cookie","id":"CVE-2025-71402"},"products":["better-auth"],"published":"2026-08-01","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":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-08-03","vendors":["better-auth"]},"summary":"Attackers can exploit a trustedOrigins validation bypass to perform open redirects, potentially stealing tokens and taking over user accounts.","url":"https://insights.sbomify.com/CVE-2025-71403/"}