CVE-2026-53518

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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

GHSA-7w99-5wm4-3g79

Published

2026-07-15T17:17:06.410Z

Modified

2026-08-12T03:51:34.526954549Z

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

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

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

f41514ef07cfafc5dbf463bd1500aee6575d88a7

Fixed

b4bc65a007784b2eb0efb459e5fa6fd8055d3ec9

Database specific

Show details

{
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ],
    "cpe": [
        "cpe:2.3:a:better-auth:better-auth\\/oauth-provider:*:*:*:*:*:node.js:*:*",
        "cpe:2.3:a:better-auth:better_auth:*:*:*:*:*:node.js:*:*"
    ],
    "extracted_events": [
        {
            "introduced": "1.6.0"
        },
        {
            "fixed": "1.6.11"
        }
    ]
}

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"