{"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-2026-53512 in the wild and no public exploit code.","fix":"Upgrade better-auth to 1.6.11 or later.","what":"CVE-2026-53512 is a critical authentication bypass vulnerability in better-auth, published on 15 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-53512 and fix it if it is affected.\n\nWhat it is: CVE-2026-53512 is a critical authentication bypass vulnerability in better-auth, published on 15 Jul 2026. 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-2026-53512 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-2026-53512/ (Markdown: https://insights.sbomify.com/CVE-2026-53512/index.md)","id":"CVE-2026-53512","markdown":"https://insights.sbomify.com/CVE-2026-53512/index.md","name":"CVE-2026-53512","record":{"aliases":["GHSA-pw9m-5jxm-xr6h"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["account_takeover","privilege_escalation"],"network_reachable":"yes","non_default_config":false,"product_category":"TypeScript auth library","requires_auth":"none","summary":"Attackers can replay OAuth refresh tokens to mint access tokens because the oidc-provider and mcp plugins fail to verify client secrets.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"better_auth","vendor":"better-auth"}],"cvss":{"score":9.1,"severity":"critical","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-345","name":"Insufficient Verification of Data Authenticity"},{"id":"CWE-863","name":"Incorrect Authorization"},{"id":"CWE-306","name":"Missing Authentication for Critical Functionality"},{"id":"CWE-287","name":"Improper Authentication"}],"description":"Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, the legacy oidcProvider and mcp plugins expose OAuth token endpoints whose refresh_token grant authenticates only possession of the bound refreshToken row and matching client_id, without verifying the confidential client's client_secret, allowing an attacker with a valid refresh_token to mint access tokens and rotated refresh tokens through /api/auth/oauth2/token or /api/auth/mcp/token. The @better-auth/oauth-provider package is not affected. 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: OAuth refresh-token replay via missing client authentication on oidc-provider and mcp plugins","id":"CVE-2026-53512","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: Server-side request forgery via unvalidated OIDC endpoints on @better-auth/sso provider registration","id":"CVE-2026-53513"},"packages":[{"ecosystem":"npm","fixed":["1.6.11"],"introduced":["0"],"last_affected":[],"package":"better-auth","purl":null,"source":"GHSA-pw9m-5jxm-xr6h"},{"ecosystem":"npm","fixed":["1.6.11"],"introduced":["0"],"last_affected":[],"package":"better-auth","purl":"pkg:npm/better-auth","source":"GHSA-pw9m-5jxm-xr6h"}],"prev":{"headline":"calibre: Arbitrary Code Execution in Template Formatter via Book Metadata","id":"CVE-2026-53511"},"products":["better-auth"],"published":"2026-07-15","related":[{"cvss_score":8.3,"headline":"Better Auth: Account takeover via OAuth auto-link to unverified pre-registered email","id":"CVE-2026-53516","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":"yes","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-07-18","vendors":["better-auth"]},"summary":"Attackers can replay OAuth refresh tokens to mint access tokens because the oidc-provider and mcp plugins fail to verify client secrets.","url":"https://insights.sbomify.com/CVE-2026-53512/"}