---
id: CVE-2026-110864
title: >-
  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
summary: >-
  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
  th…
severity: high
cvss: 7.4
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-287
vendor: better-auth
product: better-auth
affected:
  - better-auth >= 1.5.0-beta.12 < 1.7.7
published: '2026-10-14'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T18:25:45.343'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-110864'
references:
  - url: >-
      https://github.com/better-auth/better-auth/security/advisories/GHSA-r4xp-prcw-77qf
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/better-auth-1.5.0-beta.12-before-1.7.7-authentication-bypass-via-oauth-proxy
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
epss: 0.00288
epssPercentile: 0.21174
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-15T15:35:53.604112Z'
ingestedAt: '2026-10-15T00:02:07.187Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.