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CVE-2026-45337

Better Auth is an authentication and authorization library for TypeScript. From 1.6.0 until 1.6.11, the deviceAuthorization plugin treats any authenticated session as the owner of any pending device code because GET /device does not claim the row and POST /device/approve and POST /device/deny short-circuit when userId is unset, allowing an authenticated attacker who learns a valid user_code to bind the polling device to the attacker's account or deny the legitimate flow. This issue is fixed in v
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:c6ceddfc21681f12f10052134689c711342cb516932c628679e432612064ae78
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-285","description":"CWE-285: Improper Authorization","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:32a05954c339f6e43d539912979a65c0c889abae33b9d2ac7c69aa17aa5efa17 · sha256:14df4642a9528054… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-345","description":"CWE-345: Insufficient Verification of Data Authenticity","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:32a05954c339f6e43d539912979a65c0c889abae33b9d2ac7c69aa17aa5efa17 · sha256:14df4642a9528054… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"better-auth","vendor":"better-auth","versions":[{"status":"affected","version":">= 1.6.0, < 1.6.11"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:32a05954c339f6e43d539912979a65c0c889abae33b9d2ac7c69aa17aa5efa17 · sha256:14df4642a9528054… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":7.6,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:32a05954c339f6e43d539912979a65c0c889abae33b9d2ac7c69aa17aa5efa17 · sha256:14df4642a9528054… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-285","description":"CWE-285: Improper Authorization","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:32a05954c339f6e43d539912979a65c0c889abae33b9d2ac7c69aa17aa5efa17 · sha256:14df4642a9528054… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-345","description":"CWE-345: Insufficient Verification of Data Authenticity","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:32a05954c339f6e43d539912979a65c0c889abae33b9d2ac7c69aa17aa5efa17 · sha256:14df4642a9528054… · /containers/cna/problemTypes/1/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/better-auth/better-auth/commit/99a254a79b59d5a3f5ca2123260118cddb5beed7","tags":["x_refsource_MISC"],"url":"https://github.com/better-auth/better-auth/commit/99a254a79b59d5a3f5ca2123260118cddb5beed7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:32a05954c339f6e43d539912979a65c0c889abae33b9d2ac7c69aa17aa5efa17 · sha256:14df4642a9528054… · /containers/cna/references/2
{"name":"https://github.com/better-auth/better-auth/pull/9573","tags":["x_refsource_MISC"],"url":"https://github.com/better-auth/better-auth/pull/9573"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:32a05954c339f6e43d539912979a65c0c889abae33b9d2ac7c69aa17aa5efa17 · sha256:14df4642a9528054… · /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:v2:32a05954c339f6e43d539912979a65c0c889abae33b9d2ac7c69aa17aa5efa17 · sha256:14df4642a9528054… · /containers/cna/references/3
{"name":"https://github.com/better-auth/better-auth/security/advisories/GHSA-cq3f-vc6p-68fh","tags":["x_refsource_CONFIRM"],"url":"https://github.com/better-auth/better-auth/security/advisories/GHSA-cq3f-vc6p-68fh"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:32a05954c339f6e43d539912979a65c0c889abae33b9d2ac7c69aa17aa5efa17 · sha256:14df4642a9528054… · /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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