CVE-2026-110862 json
Better Auth 1.4.0-beta.18 before 1.7.7 Authentication Bypass via Magic Link
published 2026-10-14 25 d ago modified 2026-10-27 12 d ago also CVE-2026-114607 , GHSA-965c-763c-88jm , EUVD-2026-101745
- cvss
- 9.1
- 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 25%
- public exploits
- 0
- none known
Summary
Better Auth from 1.4.0-beta.18 before 1.7.7 contains an authentication bypass vulnerability that allows unauthenticated attackers to sign in as other users by reusing OAuth state values as Magic Link tokens. Attackers can start an OAuth sign-in with a victim's email and submit the returned state to Magic Link verification, gaining sessions or creating falsely email-verified accounts.
Patch / fix
- npm better-auth 1.7.7
- better-auth better-auth 1.7.7
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 24 d ago
Exploit prediction
0.32% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 9.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N |
| CNA | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
| CNA | 4.0 | 9.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/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 |
| GitHub | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | better-auth | >=1.4.0-beta.18, <1.7.7 |
1.7.7 |
Affected products
- better-auth better-auth
Classification
- Weakness
-
- CWE-287 Improper Authentication
References
-
github.com
/better-auth/better-auth/pull/11494
web
-
github.com
/better-auth/better-auth/commit/ac54bfd67821a7607533af2059858b12bc54e26a
web
-
github.com
/better-auth/better-auth/security/advisories/GHSA-965c-763c-88jm
vendor-advisory, web
-
vulncheck.com
/advisories/better-auth-1.4.0-beta.18-before-1.7.7-authentication-bypass-via-magic-link
third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-114607
advisory
-
github.com
/better-auth/better-auth
package
-
github.com
/better-auth/better-auth/releases/tag/v1.7.7
web
Sources
- CVE List CVE-2026-110862
- GitHub Advisory GHSA-965c-763c-88jm
- NVD CVE-2026-110862
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