{"cve":"CVE-2026-53515","nvd":{"published":"2026-07-15T18:16:47.817","modified":"2026-07-21T15:38:36.120","status":"Analyzed","description":"Better Auth is an authentication and authorization library for TypeScript. From 1.2.10 until 1.6.11, the @better-auth/sso plugin's POST /sso/register endpoint lets any organization member attach a new SSO provider to that organization because registerSSOProvider checks only for a membership row and does not require an owner or admin role, allowing attacker-controlled OIDC or SAML providers to drive /sso/callback/{providerId} organization provisioning. This issue is fixed in version 1.6.11.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N","score":7.1},"cwes":["CWE-269","CWE-285","CWE-863"],"references":["https://github.com/better-auth/better-auth/commit/86765f1597378f5c3deed1b80ca91faac0a6bf00","https://github.com/better-auth/better-auth/pull/9220","https://github.com/better-auth/better-auth/releases/tag/v1.6.11","https://github.com/better-auth/better-auth/security/advisories/GHSA-gv74-j8m3-fg5f"],"products":["better-auth:better-auth\\/sso","better-auth:better_auth"],"source":"nvd","synced_at":"2026-10-19T22:45:36.895656543+00:00"},"epss":{"cve":"CVE-2026-53515","score":0.00426,"percentile":0.36892,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-gv74-j8m3-fg5f","url":"https://osv.dev/vulnerability/GHSA-gv74-j8m3-fg5f","summary":"@better-auth/sso: SSO provider may allow registration for any org member without a checking their role","modified":"2026-07-20T21:15:24.421809522Z","packages":[{"ecosystem":"npm","name":"@better-auth/sso","purl":"pkg:npm/%40better-auth/sso","ranges":[">=1.2.10 <1.6.11"],"fixed":["1.6.11"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}