CVE-2026-53518

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-53518
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53518.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-53518
Aliases
Published
2026-07-15T17:17:06.410Z
Modified
2026-07-17T03:47:36.647101169Z
Severity
  • 7.6 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
Better Auth OAuth Provider: Race Condition in Authorization Code Exchange Enables Multi-Use Code Redemption
Details

Better Auth is an authentication and authorization library for TypeScript. From 1.6.0 until 1.6.11, the @better-auth/oauth-provider POST /oauth2/token endpoint for the authorization_code grant redeems a single-use authorization code through a non-atomic find-then-delete sequence, allowing two concurrent requests to pass the read step and mint independent access tokens, refresh tokens, and ID tokens; legacy /oauth2/token and /mcp/token paths in oidc-provider and mcp plugins share the same primitive. This issue is fixed in version 1.6.11.

Database specific 
{
    "cwe_ids": [
        "CWE-362",
        "CWE-367"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53518.json",
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/better-auth/better-auth

Affected ranges

Type
GIT
Repo
https://github.com/better-auth/better-auth
Events
Introduced
0e3f188020fa785d44d0019a3a3c8407a4cc8d5f
Fixed
b4bc65a007784b2eb0efb459e5fa6fd8055d3ec9
Fixed
f41514ef07cfafc5dbf463bd1500aee6575d88a7
Database specific 
{
    "extracted_events": [
        {
            "introduced": "1.6.0"
        },
        {
            "fixed": "1.6.11"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

@better-auth/api-key@1.*
@better-auth/api-key@1.6.0
@better-auth/api-key@1.6.1
@better-auth/api-key@1.6.10
@better-auth/api-key@1.6.2
@better-auth/api-key@1.6.3
@better-auth/api-key@1.6.4
@better-auth/api-key@1.6.5
@better-auth/api-key@1.6.6
@better-auth/api-key@1.6.7
@better-auth/api-key@1.6.8
@better-auth/api-key@1.6.9
@better-auth/core@1.*
@better-auth/core@1.6.0
@better-auth/core@1.6.1
@better-auth/core@1.6.10
@better-auth/core@1.6.2
@better-auth/core@1.6.3
@better-auth/core@1.6.4
@better-auth/core@1.6.5
@better-auth/core@1.6.6
@better-auth/core@1.6.7
@better-auth/core@1.6.8
@better-auth/core@1.6.9
@better-auth/drizzle-adapter@1.*
@better-auth/drizzle-adapter@1.6.0
@better-auth/drizzle-adapter@1.6.1
@better-auth/drizzle-adapter@1.6.10
@better-auth/drizzle-adapter@1.6.2
@better-auth/drizzle-adapter@1.6.3
@better-auth/drizzle-adapter@1.6.4
@better-auth/drizzle-adapter@1.6.5
@better-auth/drizzle-adapter@1.6.6
@better-auth/drizzle-adapter@1.6.7
@better-auth/drizzle-adapter@1.6.8
@better-auth/drizzle-adapter@1.6.9
@better-auth/electron@1.*
@better-auth/electron@1.6.0
@better-auth/electron@1.6.1
@better-auth/electron@1.6.10
@better-auth/electron@1.6.2
@better-auth/electron@1.6.3
@better-auth/electron@1.6.4
@better-auth/electron@1.6.5
@better-auth/electron@1.6.6
@better-auth/electron@1.6.7
@better-auth/electron@1.6.8
@better-auth/electron@1.6.9
@better-auth/expo@1.*
@better-auth/expo@1.6.0
@better-auth/expo@1.6.1
@better-auth/expo@1.6.10
@better-auth/expo@1.6.2
@better-auth/expo@1.6.3
@better-auth/expo@1.6.4
@better-auth/expo@1.6.5
@better-auth/expo@1.6.6
@better-auth/expo@1.6.7
@better-auth/expo@1.6.8
@better-auth/expo@1.6.9
@better-auth/i18n@1.*
@better-auth/i18n@1.6.0
@better-auth/i18n@1.6.1
@better-auth/i18n@1.6.10
@better-auth/i18n@1.6.2
@better-auth/i18n@1.6.3
@better-auth/i18n@1.6.4
@better-auth/i18n@1.6.5
@better-auth/i18n@1.6.6
@better-auth/i18n@1.6.7
@better-auth/i18n@1.6.8
@better-auth/i18n@1.6.9
@better-auth/kysely-adapter@1.*
@better-auth/kysely-adapter@1.6.0
@better-auth/kysely-adapter@1.6.1
@better-auth/kysely-adapter@1.6.10
@better-auth/kysely-adapter@1.6.2
@better-auth/kysely-adapter@1.6.3
@better-auth/kysely-adapter@1.6.4
@better-auth/kysely-adapter@1.6.5
@better-auth/kysely-adapter@1.6.6
@better-auth/kysely-adapter@1.6.7
@better-auth/kysely-adapter@1.6.8
@better-auth/kysely-adapter@1.6.9
@better-auth/memory-adapter@1.*
@better-auth/memory-adapter@1.6.0
@better-auth/memory-adapter@1.6.1
@better-auth/memory-adapter@1.6.10
@better-auth/memory-adapter@1.6.2
@better-auth/memory-adapter@1.6.3
@better-auth/memory-adapter@1.6.4
@better-auth/memory-adapter@1.6.5
@better-auth/memory-adapter@1.6.6
@better-auth/memory-adapter@1.6.7
@better-auth/memory-adapter@1.6.8
@better-auth/memory-adapter@1.6.9
@better-auth/mongo-adapter@1.*
@better-auth/mongo-adapter@1.6.0
@better-auth/mongo-adapter@1.6.1
@better-auth/mongo-adapter@1.6.10
@better-auth/mongo-adapter@1.6.2
@better-auth/mongo-adapter@1.6.3
@better-auth/mongo-adapter@1.6.4
@better-auth/mongo-adapter@1.6.5
@better-auth/mongo-adapter@1.6.6
@better-auth/mongo-adapter@1.6.7
@better-auth/mongo-adapter@1.6.8
@better-auth/mongo-adapter@1.6.9
@better-auth/oauth-provider@1.*
@better-auth/oauth-provider@1.6.0
@better-auth/oauth-provider@1.6.1
@better-auth/oauth-provider@1.6.10
@better-auth/oauth-provider@1.6.2
@better-auth/oauth-provider@1.6.3
@better-auth/oauth-provider@1.6.4
@better-auth/oauth-provider@1.6.5
@better-auth/oauth-provider@1.6.6
@better-auth/oauth-provider@1.6.7
@better-auth/oauth-provider@1.6.8
@better-auth/oauth-provider@1.6.9
@better-auth/passkey@1.*
@better-auth/passkey@1.6.0
@better-auth/passkey@1.6.1
@better-auth/passkey@1.6.10
@better-auth/passkey@1.6.2
@better-auth/passkey@1.6.3
@better-auth/passkey@1.6.4
@better-auth/passkey@1.6.5
@better-auth/passkey@1.6.6
@better-auth/passkey@1.6.7
@better-auth/passkey@1.6.8
@better-auth/passkey@1.6.9
@better-auth/prisma-adapter@1.*
@better-auth/prisma-adapter@1.6.0
@better-auth/prisma-adapter@1.6.1
@better-auth/prisma-adapter@1.6.10
@better-auth/prisma-adapter@1.6.2
@better-auth/prisma-adapter@1.6.3
@better-auth/prisma-adapter@1.6.4
@better-auth/prisma-adapter@1.6.5
@better-auth/prisma-adapter@1.6.6
@better-auth/prisma-adapter@1.6.7
@better-auth/prisma-adapter@1.6.8
@better-auth/prisma-adapter@1.6.9
@better-auth/redis-storage@1.*
@better-auth/redis-storage@1.6.0
@better-auth/redis-storage@1.6.1
@better-auth/redis-storage@1.6.10
@better-auth/redis-storage@1.6.2
@better-auth/redis-storage@1.6.3
@better-auth/redis-storage@1.6.4
@better-auth/redis-storage@1.6.5
@better-auth/redis-storage@1.6.6
@better-auth/redis-storage@1.6.7
@better-auth/redis-storage@1.6.8
@better-auth/redis-storage@1.6.9
@better-auth/scim@1.*
@better-auth/scim@1.6.0
@better-auth/scim@1.6.1
@better-auth/scim@1.6.10
@better-auth/scim@1.6.2
@better-auth/scim@1.6.3
@better-auth/scim@1.6.4
@better-auth/scim@1.6.5
@better-auth/scim@1.6.6
@better-auth/scim@1.6.7
@better-auth/scim@1.6.8
@better-auth/scim@1.6.9
@better-auth/sso@1.*
@better-auth/sso@1.6.0
@better-auth/sso@1.6.1
@better-auth/sso@1.6.10
@better-auth/sso@1.6.2
@better-auth/sso@1.6.3
@better-auth/sso@1.6.4
@better-auth/sso@1.6.5
@better-auth/sso@1.6.6
@better-auth/sso@1.6.7
@better-auth/sso@1.6.8
@better-auth/sso@1.6.9
@better-auth/stripe@1.*
@better-auth/stripe@1.6.0
@better-auth/stripe@1.6.1
@better-auth/stripe@1.6.10
@better-auth/stripe@1.6.2
@better-auth/stripe@1.6.3
@better-auth/stripe@1.6.4
@better-auth/stripe@1.6.5
@better-auth/stripe@1.6.6
@better-auth/stripe@1.6.7
@better-auth/stripe@1.6.8
@better-auth/stripe@1.6.9
@better-auth/telemetry@1.*
@better-auth/telemetry@1.6.0
@better-auth/telemetry@1.6.1
@better-auth/telemetry@1.6.10
@better-auth/telemetry@1.6.2
@better-auth/telemetry@1.6.3
@better-auth/telemetry@1.6.4
@better-auth/telemetry@1.6.5
@better-auth/telemetry@1.6.6
@better-auth/telemetry@1.6.7
@better-auth/telemetry@1.6.8
@better-auth/telemetry@1.6.9
@better-auth/test-utils@1.*
@better-auth/test-utils@1.6.0
@better-auth/test-utils@1.6.1
@better-auth/test-utils@1.6.10
@better-auth/test-utils@1.6.2
@better-auth/test-utils@1.6.3
@better-auth/test-utils@1.6.4
@better-auth/test-utils@1.6.5
@better-auth/test-utils@1.6.6
@better-auth/test-utils@1.6.7
@better-auth/test-utils@1.6.8
@better-auth/test-utils@1.6.9
auth@1.*
auth@1.6.0
auth@1.6.1
auth@1.6.10
auth@1.6.2
auth@1.6.3
auth@1.6.4
auth@1.6.5
auth@1.6.6
auth@1.6.7
auth@1.6.8
auth@1.6.9
better-auth@1.*
better-auth@1.6.0
better-auth@1.6.1
better-auth@1.6.10
better-auth@1.6.2
better-auth@1.6.3
better-auth@1.6.4
better-auth@1.6.5
better-auth@1.6.6
better-auth@1.6.7
better-auth@1.6.8
better-auth@1.6.9
v1.*
v1.6.0
v1.6.1
v1.6.10
v1.6.2
v1.6.3
v1.6.4
v1.6.5
v1.6.6
v1.6.7
v1.6.8
v1.6.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53518.json"