{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-53512", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-09T17:30:33.455Z", "datePublished": "2026-07-15T17:18:09.512Z", "dateUpdated": "2026-07-15T17:18:09.512Z"}, "containers": {"cna": {"title": "Better Auth: OAuth refresh-token replay via missing client authentication on oidc-provider and mcp plugins", "problemTypes": [{"descriptions": [{"cweId": "CWE-287", "lang": "en", "description": "CWE-287: Improper Authentication", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-306", "lang": "en", "description": "CWE-306: Missing Authentication for Critical Function", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-345", "lang": "en", "description": "CWE-345: Insufficient Verification of Data Authenticity", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-863", "lang": "en", "description": "CWE-863: Incorrect Authorization", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 9.1, "baseSeverity": "CRITICAL", "vectorString": "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"}}], "references": [{"name": "https://github.com/better-auth/better-auth/security/advisories/GHSA-pw9m-5jxm-xr6h", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/better-auth/better-auth/security/advisories/GHSA-pw9m-5jxm-xr6h"}, {"name": "https://github.com/better-auth/better-auth/pull/9576", "tags": ["x_refsource_MISC"], "url": "https://github.com/better-auth/better-auth/pull/9576"}, {"name": "https://github.com/better-auth/better-auth/commit/1f2ff4215c4affff0b140b0c0a712c0dde35659c", "tags": ["x_refsource_MISC"], "url": "https://github.com/better-auth/better-auth/commit/1f2ff4215c4affff0b140b0c0a712c0dde35659c"}, {"name": "https://github.com/better-auth/better-auth/releases/tag/v1.6.11", "tags": ["x_refsource_MISC"], "url": "https://github.com/better-auth/better-auth/releases/tag/v1.6.11"}], "affected": [{"vendor": "better-auth", "product": "better-auth", "versions": [{"version": "< 1.6.11", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-15T17:18:09.512Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-pw9m-5jxm-xr6h", "discovery": "UNKNOWN"}}}}

{}

{}

{}

{}