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CVE-2026-110864

Updated on 14 Oct 2026

Severity

9.1 Critical severity

Details

CVSS score
9.1
CVSS vector
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/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
CWE ID
Links
NISTCIRCLRHELUbuntu

Overview

About vulnerability

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.

Details

Affected product:
better-auth , better-auth-api-key , better-auth-cimd , better-auth-cli , better-auth-electron , better-auth-expo , better-auth-i18n , better-auth-mcp , better-auth-oauth-provider , better-auth-passkey , better-auth-redis-storage , better-auth-scim , better-auth-sso , better-auth-stripe , better-auth-test-utils , octanejs-better-auth
Affected packages:
better-auth @ 1.6.29 (+83 more)