Better Auth @better-auth/sso before 1.7.3 Authentication Bypass via Personal SSO Providers
Better Auth @better-auth/sso from 1.7.0-rc.2 before 1.7.3 contains an authentication bypass vulnerability that allows authenticated users to sign in as other users by registering a personal SSO provider. Attackers can copy a legitimate provider's OIDC issuer or SAML entity ID and assert a victim's subject or NameID, because account lookup ignores providerId, creating sessions for victim accounts.
CVE-2026-110863
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-2026-110863
sso
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": "sso",
"versions": [
{
"status": "affected",
"version": "1.7.0-rc.2",
"lessThan": "1.7.3",
"versionType": "semver"
}
],
"packageURL": "pkg:npm/%40better-auth/sso",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-110863
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #32784 · Revision 1
- Added to Heist Feed
- Publisher date