{"answers":{"affected":"2 open source packages ship an affected version, including better-auth. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-53516 in the wild and no public exploit code.","fix":"Upgrade better-auth to 1.6.11 or later.","what":"CVE-2026-53516 is a high-severity authentication bypass vulnerability in better-auth, published on 15 Jul 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-2026-53516 and fix it if it is affected.\n\nWhat it is: CVE-2026-53516 is a high-severity authentication bypass vulnerability in better-auth, published on 15 Jul 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-2026-53516 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- better-auth (npm): affected all versions; fixed in 1.6.11\n- better-auth (npm): affected all versions; fixed in 1.6.11\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-2026-53516/ (Markdown: https://insights.sbomify.com/CVE-2026-53516/index.md)","id":"CVE-2026-53516","markdown":"https://insights.sbomify.com/CVE-2026-53516/index.md","name":"CVE-2026-53516","record":{"aliases":["GHSA-g38m-r43w-p2q7"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"TypeScript authentication library","requires_auth":"none","summary":"Attackers can take over accounts by pre-registering a victim's email and exploiting OAuth auto-linking that trusts provider email verification without checking local status.","user_interaction":"required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"better_auth","vendor":"better-auth"}],"cvss":{"score":8.3,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L","version":"3.1"},"cwes":[{"id":"CWE-345","name":"Insufficient Verification of Data Authenticity"},{"id":"CWE-287","name":"Improper Authentication"}],"description":"Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, Better Auth's OAuth callback auto-link gate in handleOAuthUserInfo accepts implicit account linking when the OAuth provider asserts email_verified: true without requiring the local user row's emailVerified field to also be true, allowing an attacker who pre-registers a victim email through /sign-up/email to bind the victim's OAuth identity to the attacker's account. The same primitive affects one-tap, and emailAndPassword.requireEmailVerification: true does not mitigate the link-time verification change. This issue is fixed in version 1.6.11.","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":"Better Auth: Account takeover via OAuth auto-link to unverified pre-registered email","id":"CVE-2026-53516","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"auth_bypass","year":"2026"},"n_packages":2,"n_references":4,"next":{"headline":"Better Auth OAuth Provider: Refresh Token Rotation Race Condition Allows Concurrent Replay and Token Family Forking","id":"CVE-2026-53517"},"packages":[{"ecosystem":"npm","fixed":["1.6.11"],"introduced":["0"],"last_affected":[],"package":"better-auth","purl":null,"source":"GHSA-g38m-r43w-p2q7"},{"ecosystem":"npm","fixed":["1.6.11"],"introduced":["0"],"last_affected":[],"package":"better-auth","purl":"pkg:npm/better-auth","source":"GHSA-g38m-r43w-p2q7"}],"prev":{"headline":"Better Auth: Privilege escalation via SSO provider registration: missing admin role check in @better-auth/sso","id":"CVE-2026-53515"},"products":["better-auth"],"published":"2026-07-15","related":[{"cvss_score":9.1,"headline":"Better Auth: OAuth refresh-token replay via missing client authentication on oidc-provider and mcp plugins","id":"CVE-2026-53512","kev_date_added":null,"published":"2026-07-15"},{"cvss_score":7.9,"headline":"Better Auth has an Open Redirect Vulnerability in Verify Email Endpoint","id":"CVE-2024-56734","kev_date_added":null,"published":"2024-12-30"},{"cvss_score":7.7,"headline":"Better Auth: Unauthorized invitation acceptance via unverified email match in organization plugin","id":"CVE-2026-53514","kev_date_added":null,"published":"2026-07-15"},{"cvss_score":7.6,"headline":"Better Auth: Device authorization approve and deny accept any authenticated session while the user code is pending","id":"CVE-2026-45337","kev_date_added":null,"published":"2026-07-15"},{"cvss_score":6.9,"headline":"Beter Auth has an Open Redirect via Scheme-Less Callback Parameter","id":"CVE-2025-27143","kev_date_added":null,"published":"2025-02-24"}],"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":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-07-15","vendors":["better-auth"]},"summary":"Attackers can take over accounts by pre-registering a victim's email and exploiting OAuth auto-linking that trusts provider email verification without checking local status.","url":"https://insights.sbomify.com/CVE-2026-53516/"}