Quick answers
- Is CVE-2026-103883 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-103883 being exploited in the wild.
- How severe is CVE-2026-103883?
- High severity, with a CVSS score of 8.8, published 11 November 2026.
- Which products and versions are affected?
- 6Storage Rentals up to and including 2.31.0.
- Is there a fix for CVE-2026-103883?
- 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-2026-103883 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-103883?
- 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 plugin's `six_storage_portal_registration()` AJAX handler lacks capability checks and nonce verification, allowing any authenticated subscriber to overwrite the site-wide `six_storage_online_api_url` option with an attacker-controlled URL. The `six_storage_create_wp_user()` handler then unconditionally calls `wp_set_current_user()` and `wp_set_auth_cookie()` with data from the attacker's URL, bypassing all credential verification. This is an incomplete fix of a prior vulnerability; attackers can exploit the chain in three AJAX requests to authenticate as any known administrator.
Affected products
- 6Storage 6Storage Rentals up to and including 2.31.0
Timeline
- 2026-11-11: disclosed