Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, the @better-auth/sso plugin's POST /sso/register and POST /sso/update-provider endpoints accept attacker-controlled oidcConfig.userInfoEndpoint, tokenEndpoint, and jwksEndpoint URLs when skipDiscovery: true is set, store them on the ssoProvider row without origin validation, and fetch them during OIDC callback, allowing non-blind server-side request forgery and possible account linking when trustEmailVerified: true is configured. This issue is fixed in version 1.6.11.
{
"cna_assigner": "GitHub_M",
"cwe_ids": [
"CWE-20",
"CWE-345",
"CWE-441",
"CWE-918"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53513.json"
}{
"extracted_events": [
{
"range": [
{
"introduced": "0.1.0"
},
{
"fixed": "1.6.11"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "37f60cb176cb53147da7dfd5ec15afa5b486e81e"
}
],
"source": "REFERENCES_COMMIT"
},
{
"original_tag": "v1.6.11",
"range": [
{
"fixed": "f41514ef07cfafc5dbf463bd1500aee6575d88a7"
}
],
"source": "REFERENCES_TAG"
}
]
}