CVE-2026-110862 json
Better Auth 1.4.0-beta.18 before 1.7.7 Authentication Bypass via Magic Link
published 26d ago modified 13d ago also CVE-2026-114607 , EUVD-2026-101745 , GHSA-965c-763c-88jm
- 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
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 25d ago
Exploit prediction
0.32% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-09).
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 |
| GitHub | 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 |
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
Fencer Intel 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.