CVE-2026-53517

{"id": "CVE-2026-53517", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53517", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-07-15T19:20:42.640935Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.1, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "better-auth", "product": "better-auth", "versions": [{"status": "affected", "version": ">= 1.4.8-beta.7, < 1.6.0"}]}, {"vendor": "@better-auth", "product": "oauth-provider", "versions": [{"status": "affected", "version": ">= 1.6.0, < 1.6.11"}]}]}], "published": "2026-07-15T18:16:48.107", "references": [{"url": "https://github.com/better-auth/better-auth/commit/c6918ecc9e3a75892169415d7f6c95b591b6a52d", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/better-auth/better-auth/releases/tag/v1.6.11", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/better-auth/better-auth/security/advisories/GHSA-392p-2q2v-4372", "tags": ["Mitigation", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-362"}, {"lang": "en", "value": "CWE-367"}]}], "descriptions": [{"lang": "en", "value": "Better Auth is an authentication and authorization library for TypeScript. From 1.4.8-beta.7 until 1.6.11, the @better-auth/oauth-provider POST /oauth2/token endpoint on the refresh_token grant performs a non-atomic read, validate, revoke, and mint sequence on the oauthRefreshToken row, allowing concurrent requests with the same parent refresh token to pass the revoked check and create forked refresh-token families; the vulnerable range also includes embedded better-auth plugin versions before 1.6.0. This issue is fixed in version 1.6.11."}], "lastModified": "2026-07-21T16:00:22.173", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:better-auth:better-auth\\/oauth-provider:*:*:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "1CF0531C-8739-41D0-96F5-9A19A04F2E19", "versionEndExcluding": "1.6.11", "versionStartIncluding": "1.6.0"}, {"criteria": "cpe:2.3:a:better-auth:better_auth:*:*:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "B5552846-37CD-440F-A3F5-51DC4192ECF3", "versionEndExcluding": "1.6.11", "versionStartIncluding": "1.4.9"}, {"criteria": "cpe:2.3:a:better-auth:better_auth:1.4.8:-:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "9DEBDFBD-94A3-4E7A-837C-6761070F416D"}, {"criteria": "cpe:2.3:a:better-auth:better_auth:1.4.8:beta7:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "44F50292-6720-45F7-8100-DC80201A6DD5"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}