Medium
better-auth before 1.6.2 OAuth State Validation Bypass
Type: advisorySources: OSV
better-auth versions before 1.6.2 fail to validate the OAuth state parameter against the stored nonce when using cookie-backed state storage without PKCE. Attackers can forge the state parameter and supply an attacker-controlled authorization code to create authenticated sessions bound to the attacker's external identity or persistently link attacker accounts to victim profiles.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-67335
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 13:00 UTC · Revision 1
Source evidence
better-auth before 1.6.2 OAuth State Validation Bypass
core-osv · Original sourcePublished 1 Aug 2026, 12:22 UTC
better-auth versions before 1.6.2 fail to validate the OAuth state parameter against the stored nonce when using cookie-backed state storage without PKCE. Attackers can forge the state parameter and supply an attacker-controlled authorization code to create authenticated sessions bound to the attacker's external identity or persistently link attacker accounts to victim profiles.
osv:CVE-2026-67335
Complete source record
{
"id": "4838516b292c913acc7f03f0854e5b512dcf95ae8ae12c2c4c0942b9857341f0",
"url": "https://osv.dev/vulnerability/CVE-2026-67335",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "better-auth before 1.6.2 OAuth State Validation Bypass",
"summary": "better-auth versions before 1.6.2 fail to validate the OAuth state parameter against the stored nonce when using cookie-backed state storage without PKCE. Attackers can forge the state parameter and supply an attacker-controlled authorization code to create authenticated sessions bound to the attacker's external identity or persistently link attacker accounts to victim profiles.",
"evidence": "osv:CVE-2026-67335",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-67335",
"aliases": [
"CVE-2026-67335",
"GHSA-wxw3-q3m9-c3jr"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/better-auth/better-auth",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "700d298e1e6df7d6f381b6fa8456cc32aacf0b57"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "1.6.2"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"range": [
{
"introduced": "0"
},
{
"fixed": "1.6.2"
}
],
"source": "DESCRIPTION"
}
]
}
}
],
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67335.json"
}
}
],
"modified": "2026-10-28T02:30:50.928449988Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67335.json",
"https://github.com/better-auth/better-auth/security/advisories/GHSA-wxw3-q3m9-c3jr",
"https://nvd.nist.gov/vuln/detail/CVE-2026-67335",
"https://www.vulncheck.com/advisories/better-auth-before-oauth-state-validation-bypass"
],
"provider_metadata": {
"cwe_ids": [
"CWE-287"
],
"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67335.json"
}
},
"related_cves": [
{
"value": "CVE-2026-67335",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 519368,
"published_at": "2026-08-01T12:22:17.178+00:00"
}