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CVE-2026-53517

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
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:e70acf86df880f7ff07e7b0d1f92635c6be5f4bd5a58a47e624201b220d8b491
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"product":"oauth-provider","vendor":"@better-auth","versions":[{"status":"affected","version":">= 1.6.0, < 1.6.11"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f7604d1cba137e827e42ee0c1eedffcc7842eb63afa143c5ab1edc485e2361a0 · sha256:9a8cb231e2d76621… · /containers/cna/affected/1

{"product":"better-auth","vendor":"better-auth","versions":[{"status":"affected","version":">= 1.4.8-beta.7, < 1.6.0"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f7604d1cba137e827e42ee0c1eedffcc7842eb63afa143c5ab1edc485e2361a0 · sha256:9a8cb231e2d76621… · /containers/cna/affected/0
cwe · 2 assertions

{"cweId":"CWE-367","description":"CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f7604d1cba137e827e42ee0c1eedffcc7842eb63afa143c5ab1edc485e2361a0 · sha256:9a8cb231e2d76621… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-362","description":"CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f7604d1cba137e827e42ee0c1eedffcc7842eb63afa143c5ab1edc485e2361a0 · sha256:9a8cb231e2d76621… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

2 source assertions
{"product":"oauth-provider","vendor":"@better-auth","versions":[{"status":"affected","version":">= 1.6.0, < 1.6.11"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f7604d1cba137e827e42ee0c1eedffcc7842eb63afa143c5ab1edc485e2361a0 · sha256:9a8cb231e2d76621… · /containers/cna/affected/1
{"product":"better-auth","vendor":"better-auth","versions":[{"status":"affected","version":">= 1.4.8-beta.7, < 1.6.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f7604d1cba137e827e42ee0c1eedffcc7842eb63afa143c5ab1edc485e2361a0 · sha256:9a8cb231e2d76621… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:f7604d1cba137e827e42ee0c1eedffcc7842eb63afa143c5ab1edc485e2361a0 · sha256:9a8cb231e2d76621… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-367","description":"CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f7604d1cba137e827e42ee0c1eedffcc7842eb63afa143c5ab1edc485e2361a0 · sha256:9a8cb231e2d76621… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-362","description":"CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f7604d1cba137e827e42ee0c1eedffcc7842eb63afa143c5ab1edc485e2361a0 · sha256:9a8cb231e2d76621… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/better-auth/better-auth/commit/c6918ecc9e3a75892169415d7f6c95b591b6a52d","tags":["x_refsource_MISC"],"url":"https://github.com/better-auth/better-auth/commit/c6918ecc9e3a75892169415d7f6c95b591b6a52d"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f7604d1cba137e827e42ee0c1eedffcc7842eb63afa143c5ab1edc485e2361a0 · sha256:9a8cb231e2d76621… · /containers/cna/references/1
{"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"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f7604d1cba137e827e42ee0c1eedffcc7842eb63afa143c5ab1edc485e2361a0 · sha256:9a8cb231e2d76621… · /containers/cna/references/2
{"name":"https://github.com/better-auth/better-auth/security/advisories/GHSA-392p-2q2v-4372","tags":["x_refsource_CONFIRM"],"url":"https://github.com/better-auth/better-auth/security/advisories/GHSA-392p-2q2v-4372"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f7604d1cba137e827e42ee0c1eedffcc7842eb63afa143c5ab1edc485e2361a0 · sha256:9a8cb231e2d76621… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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