Sixstorage 6Storage Rentals Plugin up to 2.27.0 on WordPress AJAX six_storage_create_wp_user improper authentication

Summaryinfo

A vulnerability marked as critical has been reported in Sixstorage 6Storage Rentals Plugin up to 2.27.0. Affected by this issue is the function six_storage_create_wp_user of the component AJAX Handler. The manipulation leads to improper authentication. This vulnerability is traded as CVE-2026-15303. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Sixstorage 6Storage Rentals Plugin up to 2.27.0. It has been rated as critical. This issue affects the function six_storage_create_wp_user of the component AJAX Handler. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at wordfence.com. The identification of this vulnerability is CVE-2026-15303 since 07/09/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/15/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-58840). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• WordPress Plugin

Vendor

• Sixstorage

Name

• 6Storage Rentals Plugin

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13
• 2.14
• 2.15
• 2.16
• 2.17
• 2.18
• 2.19
• 2.20
• 2.21
• 2.22
• 2.23
• 2.24
• 2.25
• 2.26
• 2.27.0

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

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Threat Intelligenceinfo

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Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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