GHSA-W277-2XMJ-J2RC
Vulnerability from github – Published: 2026-08-01 15:30 – Updated: 2026-08-01 15:30better-auth before 1.6.13 (and pre-release builds 1.7.0-beta.0 through 1.7.0-beta.3) fail to validate the scheme of redirect_uris registered via the deprecated oidc-provider plugin and the mcp plugin (which wraps the same provider). An attacker can register an OAuth client with a javascript: redirect_uri, which the authorization server later returns unchanged in the consent response. If the deployment's consent page navigates the browser to the returned redirectURI (e.g. assigning it to window.location.href), the attacker's JavaScript executes in the authorization-server origin, exposing the victim's session and enabling account takeover.
{
"affected": [],
"aliases": [
"CVE-2026-67333"
],
"database_specific": {
"cwe_ids": [
"CWE-79"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-01T13:17:04Z",
"severity": "MODERATE"
},
"details": "better-auth before 1.6.13 (and pre-release builds 1.7.0-beta.0 through 1.7.0-beta.3) fail to validate the scheme of redirect_uris registered via the deprecated oidc-provider plugin and the mcp plugin (which wraps the same provider). An attacker can register an OAuth client with a javascript: redirect_uri, which the authorization server later returns unchanged in the consent response. If the deployment\u0027s consent page navigates the browser to the returned redirectURI (e.g. assigning it to window.location.href), the attacker\u0027s JavaScript executes in the authorization-server origin, exposing the victim\u0027s session and enabling account takeover.",
"id": "GHSA-w277-2xmj-j2rc",
"modified": "2026-08-01T15:30:29Z",
"published": "2026-08-01T15:30:29Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/better-auth/better-auth/security/advisories/GHSA-86j7-9j95-vpqj"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-67333"
},
{
"type": "WEB",
"url": "https://www.vulncheck.com/advisories/better-auth-before-stored-xss-via-javascript-redirect-uri"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"type": "CVSS_V4"
}
]
}
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