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CVE-2026-64665 – Authentication Bypass (OAuth Account Takeover) – Statamic CMS < 5.74.1 and 6.0.0–6.

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Summary

CVE-2026-64665 is an authentication bypass (account takeover) vulnerability in Statamic CMS. When OAuth login is enabled with a provider that does not guarantee verified email addresses, an unauthenticated attacker can sign in as an existing user — potentially a super admin — by spoofing that user’s email address. It is rated High severity (CVSS 8.1).

Technical details

  • Root cause: During OAuth login, Statamic matches an OAuth identity to an existing local account based solely on the email address returned by the provider, without confirming that the provider verified ownership of that address (CWE-287 Improper Authentication, CWE-290 Authentication Bypass by Spoofing).
  • Trigger conditions: OAuth login must be explicitly enabled and configured with an identity provider that does not guarantee verified email addresses.
  • Attack vector: Network (AV:N). An unauthenticated attacker authenticates via the unverified-email provider using the email address of a target account. High attack complexity (AC:H).
  • Impact: Full takeover of the matched account, including administrative/super admin accounts, resulting in loss of confidentiality, integrity, and availability.

Affected software

  • Statamic CMS v5.x: all versions before 5.74.1
  • Statamic CMS v6.x: 6.0.0 through versions before 6.24.0

Severity

  • CVSS v3.1 base score: 8.1 (High)
  • Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade to Statamic 5.74.1 or 6.24.0.
  • If no patch can be applied: Restrict OAuth to providers that guarantee verified email addresses, or disable OAuth login entirely if it is not essential.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • x-powered-by response header: Statamic

References

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