Critical
Better Auth: OAuth refresh-token replay via missing client authentication on oidc-provider and mcp plugins
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-53512
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 07:07 UTC · Revision 1
Source evidence
Better Auth: OAuth refresh-token replay via missing client authentication on oidc-provider and mcp plugins
core-osv · Original sourcePublished 15 Jul 2026, 17:18 UTC
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.
osv:CVE-2026-53512
Complete source record
{
"id": "9106cdbe0852f2fe76166b1f4051b73ed02b753bd2ff515139897c7c8de80d55",
"url": "https://osv.dev/vulnerability/CVE-2026-53512",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Better Auth: OAuth refresh-token replay via missing client authentication on oidc-provider and mcp plugins",
"summary": "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.",
"evidence": "osv:CVE-2026-53512",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2026-53512",
"aliases": [
"CVE-2026-53512",
"GHSA-pw9m-5jxm-xr6h"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "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"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/better-auth/better-auth",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "f41514ef07cfafc5dbf463bd1500aee6575d88a7"
},
{
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],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:better-auth:better_auth:*:*:*:*:*:node.js:*:*",
"range": [
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{
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}
],
"source": "CPE_RANGE"
},
{
"range": [
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],
"source": "REFERENCES_COMMIT"
},
{
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],
"source": "REFERENCES_TAG",
"original_tag": "v1.6.11"
}
]
}
}
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53512.json"
}
}
],
"modified": "2026-10-28T02:30:26.600000593Z",
"provider": "osv",
"references": [
"https://github.com/better-auth/better-auth/releases/tag/v1.6.11",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53512.json",
"https://github.com/better-auth/better-auth/security/advisories/GHSA-pw9m-5jxm-xr6h",
"https://nvd.nist.gov/vuln/detail/CVE-2026-53512",
"https://github.com/better-auth/better-auth/commit/1f2ff4215c4affff0b140b0c0a712c0dde35659c",
"https://github.com/better-auth/better-auth/pull/9576"
],
"provider_metadata": {
"cwe_ids": [
"CWE-287",
"CWE-306",
"CWE-345",
"CWE-863"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53512.json"
}
},
"related_cves": [
{
"value": "CVE-2026-53512",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 493224,
"published_at": "2026-07-15T17:18:09.512+00:00"
}