What is CVE-2026-15303?

CVE-2026-15303 is a critical-severity vulnerability in Sixstorage 6storage Rentals, classified under Improper Authentication. CVSS score: 9.8/10. Published 2026-08-15.

How severe is CVE-2026-15303?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Sixstorage 6storage Rentals

CVE-2026-15303

The 6Storage Rentals plugin for WordPress is vulnerable to authentication bypass in versions up to, and including, 2.27.0. This is due to the six_storage_create_wp_user() AJAX handler being registered on wp_ajax_nopriv_six_storage_create_wp_user without any nonce, capability, credential, or ownership verification, while calling wp_set_current_user() and wp_set_auth_cookie() for any WordPress user resolved by the attacker-supplied email address. This makes it possible for unauthenticated attackers to log in as any existing WordPress user, including administrators, by submitting that user's email address.

Vulnerability class: Broken Authentication

CVSS v3 metric

CVSS v3 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.

Affected products

Sixstorage 6storage Rentals — versions 0

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

Frequently asked questions

What is CVE-2026-15303?: CVE-2026-15303 is a critical-severity vulnerability in Sixstorage 6storage Rentals, classified under Improper Authentication. CVSS score: 9.8/10. Published 2026-08-15.
How severe is CVE-2026-15303?: Critical severity. CVSS v3 base score is 9.8 out of 10.