CVE-2026-15303: CWE-287 Improper Authentication in sixstorage 6Storage Rentals
The 6Storage Rentals WordPress plugin contains a critical authentication bypass vulnerability in versions up to and including 2.27.0. This flaw allows unauthenticated attackers to log in as any existing WordPress user, including administrators, by exploiting an AJAX handler that lacks proper verification. The vulnerability arises because the six_storage_create_wp_user() AJAX handler is registered without nonce, capability, credential, or ownership checks, enabling attackers to impersonate users by submitting their email addresses.
AI Analysis
Technical Summary
CVE-2026-15303 is an authentication bypass vulnerability in the 6Storage Rentals WordPress plugin (up to version 2.27.0). The issue stems from the six_storage_create_wp_user() AJAX handler being exposed on wp_ajax_nopriv_six_storage_create_wp_user without any nonce or capability verification. This handler calls wp_set_current_user() and wp_set_auth_cookie() based solely on an attacker-supplied email address, allowing unauthenticated attackers to log in as any WordPress user, including administrators.
Potential Impact
Successful exploitation allows an unauthenticated attacker to fully impersonate any WordPress user by submitting their email address, leading to complete compromise of the affected WordPress site. This includes administrative access, which can result in full site takeover, data theft, or site defacement.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the AJAX endpoint if possible or disable the 6Storage Rentals plugin to prevent exploitation.
CVE-2026-15303: CWE-287 Improper Authentication in sixstorage 6Storage Rentals
Description
The 6Storage Rentals WordPress plugin contains a critical authentication bypass vulnerability in versions up to and including 2.27.0. This flaw allows unauthenticated attackers to log in as any existing WordPress user, including administrators, by exploiting an AJAX handler that lacks proper verification. The vulnerability arises because the six_storage_create_wp_user() AJAX handler is registered without nonce, capability, credential, or ownership checks, enabling attackers to impersonate users by submitting their email addresses.
CVSS v3.1
Score 9.8critical
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-15303 is an authentication bypass vulnerability in the 6Storage Rentals WordPress plugin (up to version 2.27.0). The issue stems from the six_storage_create_wp_user() AJAX handler being exposed on wp_ajax_nopriv_six_storage_create_wp_user without any nonce or capability verification. This handler calls wp_set_current_user() and wp_set_auth_cookie() based solely on an attacker-supplied email address, allowing unauthenticated attackers to log in as any WordPress user, including administrators.
Potential Impact
Successful exploitation allows an unauthenticated attacker to fully impersonate any WordPress user by submitting their email address, leading to complete compromise of the affected WordPress site. This includes administrative access, which can result in full site takeover, data theft, or site defacement.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the AJAX endpoint if possible or disable the 6Storage Rentals plugin to prevent exploitation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-07-09T16:10:31.973Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a7fd216bf8831d53949a641
Added to database: 08/15/2026, 02:42:30 UTC
Last enriched: 08/15/2026, 02:56:18 UTC
Last updated: 08/15/2026, 03:01:08 UTC
Views: 3
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.