Vulnerability details
CVE-2026-110864
better-auth better-auth
Better Auth 1.5.0-beta.12 before 1.7.7 Authentication Bypass via OAuth Proxy
CVSS 4.0
9.1Critical
Official description
Better Auth from 1.5.0-beta.12 before 1.7.7 contains an authentication bypass vulnerability in the OAuth Proxy plugin that allows unauthenticated attackers to sign in as other users by forging encrypted profiles. When the proxy shares the global secret and cookie-stored state is used, attackers can obtain encrypted state for a fake profile with a victim's verified email to take over the account via implicit linking.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.1Critical | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N |
| 7.4High | 3.1 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| better-auth | better-auth | 1.5.0-beta.12 ≤ 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
- 19 · Low
Exploit prediction (EPSS)
0.28%
Probability of exploitation in 30 days
21.4%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-287Improper Authentication