CVE-2026-15303 6Storage Rentals <= 2.27.0 - Unauthenticated Account Takeover via 'email' Parameter
Unauthenticated attackers can log in as any WordPress user, including administrators, by supplying their email address to a vulnerable AJAX handler.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-15303?
CVE-2026-15303 is a critical authentication bypass vulnerability in sixstorage 6Storage Rentals, published on 15 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-287
Which versions are affected by CVE-2026-15303?
How do I fix CVE-2026-15303?
No fix has been published for CVE-2026-15303 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-15303 being exploited?
There is no known exploitation of CVE-2026-15303 in the wild and no public exploit code.
Sources
Also known as CVE-2026-16249, GHSA-q5fr-2gmw-7f29.