@better-auth/sso before 1.6.21 Account Takeover via SSO
@better-auth/sso versions before 1.6.21 contain multiple authentication bypass vulnerabilities in SSO provider handling that allow attackers to sign in as arbitrary users. Attackers can exploit domain verification parsing mismatches, orphaned provider accounts, unbound SAML assertions, or reflected XSS on logout endpoints to gain unauthorized session access and account takeover.
CVE-2026-67328
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-2026-67328
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
sso
Source reference: /containers/cna/affected/1/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": "0",
"lessThan": "1.6.21",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "1.6.21",
"versionType": "semver"
}
],
"packageURL": "pkg:npm/%40better-auth/sso",
"defaultStatus": "unaffected"
},
{
"vendor": "better-auth",
"product": "sso",
"versions": [
{
"status": "affected",
"version": "1.7.0-beta.0",
"lessThan": "1.7.0-beta.10",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "1.7.0-beta.10",
"versionType": "semver"
}
],
"packageURL": "pkg:npm/%40better-auth/sso",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-67328
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #12806 · Revision 1
- Added to Heist Feed
- Publisher date