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better-auth before 1.6.22 Account Takeover via Magic-Link Email-OTP

Type: advisorySources: OSV

better-auth versions >= 1.1.3 and < 1.6.22 (and pre-release versions >= 1.7.0-beta.0 and < 1.7.0-beta.10) are vulnerable to account takeover via pre-account hijacking on magic-link and email-OTP sign-in when open email/password registration is enabled. An attacker registers an account with the victim's email address and an attacker-chosen password; the account remains unverified. When the legitimate owner later signs in via the magic-link or email-OTP passwordless flow, the account is marked verified without removing the pre-existing password or revoking existing sessions, so the attacker's password remains valid, granting persistent access to the victim's account. Fixed in 1.6.22 and 1.7.0-beta.10.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-67327
Confirmed fixed CVEs
Not specified
Updated in this feed
5 Nov 2026, 01:23 UTC · Revision 1

Source evidence

better-auth before 1.6.22 Account Takeover via Magic-Link Email-OTP

core-osv · Original source

Published 1 Aug 2026, 12:22 UTC

better-auth versions >= 1.1.3 and < 1.6.22 (and pre-release versions >= 1.7.0-beta.0 and < 1.7.0-beta.10) are vulnerable to account takeover via pre-account hijacking on magic-link and email-OTP sign-in when open email/password registration is enabled. An attacker registers an account with the victim's email address and an attacker-chosen password; the account remains unverified. When the legitimate owner later signs in via the magic-link or email-OTP passwordless flow, the account is marked verified without removing the pre-existing password or revoking existing sessions, so the attacker's password remains valid, granting persistent access to the victim's account. Fixed in 1.6.22 and 1.7.0-beta.10.

osv:CVE-2026-67327
Complete source record
{
  "id": "37cab92c122578eece952db93f1e3ba7312c139bc04b670e8621c62940180ba7",
  "url": "https://osv.dev/vulnerability/CVE-2026-67327",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "better-auth before 1.6.22 Account Takeover via Magic-Link Email-OTP",
    "summary": "better-auth versions >= 1.1.3 and < 1.6.22 (and pre-release versions >= 1.7.0-beta.0 and < 1.7.0-beta.10) are vulnerable to account takeover via pre-account hijacking on magic-link and email-OTP sign-in when open email/password registration is enabled. An attacker registers an account with the victim's email address and an attacker-chosen password; the account remains unverified. When the legitimate owner later signs in via the magic-link or email-OTP passwordless flow, the account is marked verified without removing the pre-existing password or revoking existing sessions, so the attacker's password remains valid, granting persistent access to the victim's account. Fixed in 1.6.22 and 1.7.0-beta.10.",
    "evidence": "osv:CVE-2026-67327",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-67327",
      "aliases": [
        "CVE-2026-67327",
        "GHSA-qq9h-g4jm-xgf3"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/better-auth/better-auth",
              "type": "GIT",
              "events": [
                {
                  "introduced": "73c98e50b90b0aa2b1320e52bcd216a1e410e62b"
                },
                {
                  "fixed": "a90d061de7cdbd60e796230aadf5d1082add1fe2"
                },
                {
                  "introduced": "c8cf0f7c1a26ac70504a76f47d736c56cb029320"
                },
                {
                  "fixed": "ba52913eed6e7210808511752bf546981f6980f5"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "1.1.3"
                      },
                      {
                        "fixed": "1.6.22"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "1.7.0-beta.0"
                      },
                      {
                        "fixed": "1.7.0-beta.10"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67327.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:41.325060489Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67327.json",
        "https://github.com/better-auth/better-auth/security/advisories/GHSA-qq9h-g4jm-xgf3",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-67327",
        "https://www.vulncheck.com/advisories/better-auth-before-account-takeover-via-magic-link-email-otp"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-287"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67327.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-67327",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 509046,
  "published_at": "2026-08-01T12:22:17.753+00:00"
}