CVE-2026-45337
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedBetter 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 version 1.6.11.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceThe deviceAuthorization plugin in Better Auth versions 1.6.0 through 1.6.11 has an authorization bypass where GET /device does not claim ownership of pending device codes, and POST /device/approve and POST /device/deny short-circuit when userId is unset. This allows any authenticated user who knows a valid user_code to bind the polling device to their own account or deny legitimate authorization flows.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data>= 1.6.0, < 1.6.11CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check Better Auth versionInspect your package.json file or run `npm list better-auth` to see the installed version of better-authAffected if The installed version is >= 1.6.0 and < 1.6.11
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Verify deviceAuthorization plugin is enabledExamine your auth configuration file where you initialize Better Auth - look for `deviceAuthorization` in the plugins list or imported modulesAffected if The deviceAuthorization plugin is included in your auth setup
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Confirm device code endpoints are exposedCheck your API routes configuration - the affected endpoints are GET /device, POST /device/approve, and POST /device/deny - verify these routes exist in your route definitionsAffected if The device authorization endpoints are registered and accessible in your application
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Verify user authentication is in useConfirm that your application uses Better Auth's session-based authentication - check that users can authenticate and receive session tokensAffected if User authentication is enabled and users can obtain valid session credentials
You are affected if Better Auth version is between 1.6.0 and 1.6.11 inclusive, the deviceAuthorization plugin is enabled, and your users authenticate via Better Auth sessions.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped1.6.11
Upgrade Better Auth to version 1.6.11 or later to receive the patch that properly validates device code ownership before allowing approval or denial.
1.6.11
- Upgrade Better Auth to version 1.6.11 or later to remediate the deviceAuthorization plugin vulnerability
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation2.0 h
- Testing3.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-45337 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-45337 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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