Authenticated device-flow hijack via missing owner binding
Published Jul 15, 2026 · Updated Jul 15, 2026
Improper authorization in Better Auth 1.6.0 through 1.6.10 allows remote authenticated users to hijack pending device flows. The deviceAuthorization plugin leaves userId unset after GET /device, so approve and deny accept any authenticated session instead of the verifier's session. Exploitation requires the plugin and a valid pending user_code learned before approval; it binds the polling device to the attacker's account or denies the legitimate sign-in.
Summary
What happened
Improper authorization in Better Auth 1.6.0 through 1.6.10 allows remote authenticated users to hijack pending device flows. The deviceAuthorization plugin leaves userId unset after GET /device, so approve and deny accept any authenticated session instead of the verifier's session. Exploitation requires the plugin and a valid pending user_code learned before approval; it binds the polling device to the attacker's account or denies the legitimate sign-in.
The record
- CVE
- CVE-2026-45337
- Published
- Jul 15, 2026
- Updated
- Jul 15, 2026
- Vendor
- Better Auth
- Product
- Better Auth
- Classifications
- CWE-285, CWE-639, CWE-863
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 15, 2026CVE publishedPublication date reported by the CVE source.
- Jul 15, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 1.6.0, < 1.6.11
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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