PT-2026-114178 · Better Auth+1 · Better Auth
CVSS v4.0
9.1
Critical
| Vector | AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N |
Name of the Vulnerable Software and Affected Versions
Better Auth versions 1.5.0-beta.12 through 1.7.6
Description
An authentication bypass exists in the OAuth Proxy plugin. Unauthenticated attackers can sign in as other users by forging encrypted profiles. This occurs when the proxy shares the global secret and cookie-stored state is utilized, allowing attackers to obtain an encrypted state for a fake profile containing a victim's verified email to achieve account takeover via implicit linking.
Recommendations
Update Better Auth to version 1.7.7 or later.
Exploit
Fix
Improper Authentication
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Weakness Enumeration
Related Identifiers
Affected Products
Better Auth