Better Auth 1.4.0-beta.18 before 1.7.7 Authentication Bypass via Magic Link
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.
CVE-2026-110862
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-110862
better-auth
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "better-auth",
"product": "better-auth",
"versions": [
{
"status": "affected",
"version": "1.4.0-beta.18",
"lessThan": "1.7.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "1.7.7",
"versionType": "semver"
}
],
"packageURL": "pkg:npm/better-auth",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-110862
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #28700 · Revision 1
- Added to Heist Feed
- Publisher date