Quick answers
- Is CVE-2026-15303 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-15303 being exploited in the wild.
- How severe is CVE-2026-15303?
- Critical severity, with a CVSS score of 9.8, published 15 August 2026.
- Which products and versions are affected?
- 6Storage Rentals up to and including 2.27.0.
- Is there a fix for CVE-2026-15303?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-15303 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-15303?
- Check whether you run 6Storage Rentals at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is an authentication bypass in the six_storage_create_wp_user() AJAX handler, registered via wp_ajax_nopriv_six_storage_create_wp_user without any nonce, capability, or credential verification. The handler calls wp_set_current_user() and wp_set_auth_cookie() based on an attacker-supplied email address, allowing session hijacking of any existing WordPress user. No authentication or authorization checks are performed, making the endpoint accessible to unauthenticated users. An attacker need only submit a target user's email address to impersonate that user. Patches are available in versions after 2.27.0.
Affected products
- 6Storage Rentals up to and including 2.27.0
Timeline
- 2026-08-15: disclosed
- 2026-08-15: advisory: CVE-2026-15303 published