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CVE-2026-15303 – Authentication Bypass (Admin Account Takeover) – 6Storage Rentals WordPress Plugin

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Summary

CVE-2026-15303 is a critical authentication bypass vulnerability in the 6Storage Rentals WordPress plugin, affecting all versions up to and including 2.27.0. The flaw resides in an AJAX handler that fails to perform nonce, capability, or credential verification, allowing an unauthenticated attacker to log in as any existing WordPress user — including administrators — simply by submitting that user’s email address. Given the network attack vector, low complexity, and full compromise of confidentiality, integrity, and availability, the vulnerability carries a CVSS v3.1 base score of 9.8 (Critical).

Technical details

  • Root cause: The plugin registers an AJAX action (implemented in Six_Storage_DashboardController.php) that authenticates a user based solely on a submitted email address, without validating a WordPress nonce, checking user capabilities, or requiring a password/credential of any kind.
  • Trigger conditions: An attacker sends a crafted, unauthenticated HTTP request to the vulnerable AJAX endpoint (wp_ajax_nopriv_* hook) supplying the email address of a target account.
  • Attack vector: Network — no authentication, user interaction, or special privileges are required to exploit the flaw.
  • Impact: Successful exploitation allows an attacker to fully impersonate any WordPress user on the site, including administrators, leading to complete takeover of the WordPress installation (content tampering, plugin/theme installation for further code execution, data theft, and site defacement).
  • Weakness classification: CWE-287 (Improper Authentication).

Affected software

  • Plugin: 6Storage Rentals (WordPress plugin)
  • Vendor: sixstorage
  • Affected versions: All versions up to and including 2.27.0

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: As of this writing, no version of 6Storage Rentals beyond the affected 2.27.0 release has been confirmed by the vendor to fix this issue. The plugin listing on the WordPress.org repository has also been closed pending review, meaning it may no longer be available for direct download/update through the standard channel. Security teams should treat this as an unpatched, actively exposed risk.
  • If no patch is available:
    • Immediately deactivate and remove the 6Storage Rentals plugin from all WordPress sites until an official, verified patched release is published by the vendor.
    • If the plugin must remain active, restrict or block access to the vulnerable AJAX endpoint (admin-ajax.php action associated with the plugin’s login/user-lookup functionality) at the web application firewall (WAF) or reverse proxy layer.
    • Monitor logs for unauthenticated POST requests to wp-admin/admin-ajax.php referencing 6Storage login/session actions, particularly those supplying arbitrary email parameters.
    • Force a password reset and review administrator/session activity for all WordPress accounts on affected sites, since impersonation may already have occurred if the plugin has been in use.
    • Enable multi-factor authentication (MFA) at the WordPress core or hosting level where possible, as an additional compensating control against session/account impersonation.

References

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