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CVE-2026-82228 – Two-Factor Authentication Bypass – SiteGround Security WordPress Plugin (≤ 1.6.6)

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Summary

CVE-2026-82228 is an unauthenticated two-factor authentication (2FA) bypass vulnerability in the SiteGround Security WordPress plugin (package sg-security), affecting versions up to and including 1.6.6. The flaw is classified as CWE-290 (Authentication Bypass by Spoofing) and rated High severity (CVSS 3.1 base score 8.1). It allows an attacker to circumvent the plugin’s 2FA protections without needing valid credentials or user interaction.

Technical details

  • Root cause: improper authentication handling in the plugin’s two-factor authentication mechanism (CWE-290, Authentication Bypass by Spoofing).
  • Trigger conditions: no privileges or user interaction are required to exploit the flaw.
  • Attack vector: network-based (remote, unauthenticated).
  • Impact: successful exploitation results in high impact to confidentiality, integrity, and availability of the affected WordPress site.

Affected software

  • SiteGround Security WordPress plugin (sg-security) versions up to and including 1.6.6.
  • Fixed in version 1.6.7 and later.

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: Update the SiteGround Security plugin to version 1.6.7 or later, where this issue is fixed.
  • If immediate patching is not possible, review site access logs for anomalous authentication activity and consider temporarily disabling the plugin’s 2FA feature only if compensating access controls (e.g., IP allow-listing, additional authentication layers) are in place.

References

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