Vulnerability details
CVE-2026-110862
better-auth better-auth
Better Auth 1.4.0-beta.18 before 1.7.7 Authentication Bypass via Magic Link
CVSS 4.0
9.3Critical
Official description
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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.3Critical | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | 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 |
| 9.1Critical | 3.1 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| better-auth | better-auth | 1.4.0-beta.18 ≤ v < 1.7.7 | CVEProject cvelistV5 (CNA) |
References and advisories
2
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Details
- Published
- 2026-10-15
- Last updated
- 2026-10-15
- State
- Published
- Assigner (CNA)
- VulnCheck
- Kolun priority
- 20 · Low
Exploit prediction (EPSS)
0.32%
Probability of exploitation in 30 days
25.2%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-287Improper Authentication