CVE-2026-109346 json
better-auth 1.3.8-beta.3 before 1.7.0-rc.3 Device Authorization Phishing via /device
published 2026-10-12 28 d ago modified 2026-10-27 13 d ago also EUVD-2026-97648 , GHSA-q84f-53jg-9ppm
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 20%
- public exploits
- 0
- none known
Summary
better-auth from 1.3.8-beta.3 before 1.7.0-rc.3 contains a UI misrepresentation vulnerability in the deviceAuthorization plugin because GET /device omits the requesting client_id and scope. Attackers can start a device request via /device/code, trick signed-in users into approving the code, then redeem it at /device/token for a live session token.
Patch / fix
- npm better-auth 1.7.0-rc.3
- better-auth better-auth 1.7.0-rc.3
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 14 d ago
Exploit prediction
0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.5 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N |
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N |
| GitHub | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N |
| CNA | 4.0 | 8.5 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | better-auth | >=1.3.8-beta.3, <1.7.0-rc.3 |
1.7.0-rc.3 |
Affected products
- better-auth better-auth
Classification
- Weakness
-
- CWE-451 User Interface (UI) Misrepresentation of Critical Information
References
-
github.com
/better-auth/better-auth/commit/f68044dcfbd9fb83763249ed9509cfacbcce47be
web
-
github.com
/better-auth/better-auth/security/advisories/GHSA-q84f-53jg-9ppm
vendor-advisory, web
-
vulncheck.com
/advisories/better-auth-1.3.8-beta.3-before-1.7.0-rc.3-device-authorization-phishing-via-device
third-party-advisory
-
github.com
/better-auth/better-auth
package
-
github.com
/better-auth/better-auth/releases/tag/v1.7.0-rc.3
web
Sources
- CVE List CVE-2026-109346
- GitHub Advisory GHSA-q84f-53jg-9ppm
- NVD CVE-2026-109346
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.