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CVE-2026-110862 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:7.4 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CNA: [email protected]CVSS-B:9.1 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/better-auth/better-auth/security/advisories/GHSA-965c-763c-88jm	[email protected]	AdvisoryRemedyVendor
https://www.vulncheck.com/advisories/better-auth-1.4.0-beta.18-before-1.7.7-authentication-bypass-via-magic-link	[email protected]	AdvisoryRemedy

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-287	Improper Authentication	[email protected]

Affected Products

Product	Versions
Better Auth	>= 1.4.0-beta.18, < 1.7.7 (semver)
CPE cpe:2.3:a:better-auth:better_auth::::::node.js::* Remediation Upgrade: 1.7.7moderate effort Mitigation:low effort Set `account.storeStateStrategy` to "cookie". If you also use OAuth Proxy, first configure one dedicated OAuth Proxy `secret` across all participating environments that differs from each environment's global Better Auth secret. Cookie-backed state can expose a separate OAuth Proxy account-takeover path when the proxy shares the global secret and implicit account linking is enabled. Mitigation:low effort Set the Magic Link plugin option `storeToken` to "hashed" and leave global `verification.storeIdentifier` unset or set it to "plain". Global identifier hashing does not prevent this issue when Magic Link tokens are also hashed. Mitigation:low effort Turn off Magic Link sign-in, or turn off social and Generic OAuth sign-in. Setting `disableSignUp: true` on the Magic Link plugin is not enough. It only stops the creation of new verified accounts. It does not stop the takeover of existing accounts.

Product

Versions

Better Auth

>= 1.4.0-beta.18, < 1.7.7 (semver)

CPE

cpe:2.3:a:better-auth:better_auth:*:*:*:*:*:node.js:*:*

Remediation

Upgrade: 1.7.7moderate effort
Mitigation:low effort
Set `account.storeStateStrategy` to "cookie". If you also use OAuth Proxy, first configure one dedicated OAuth Proxy `secret` across all participating environments that differs from each environment's global Better Auth secret. Cookie-backed state can expose a separate OAuth Proxy account-takeover path when the proxy shares the global secret and implicit account linking is enabled.
Mitigation:low effort
Set the Magic Link plugin option `storeToken` to "hashed" **and** leave global `verification.storeIdentifier` unset or set it to "plain". Global identifier hashing does not prevent this issue when Magic Link tokens are also hashed.
Mitigation:low effort
Turn off Magic Link sign-in, or turn off social and Generic OAuth sign-in. Setting `disableSignUp: true` on the Magic Link plugin is not enough. It only stops the creation of new verified accounts. It does not stop the takeover of existing accounts.

Change History

2 change records found show changes

Date	Action	Recorded By
Oct 15, 2026	CVE Modified	CISA-ADP
Oct 14, 2026	New CVE Received	[email protected]