CVE-2026-89064 Information disclosure in All-in-One WP Migration and Backup
Unauthenticated attackers can harvest or overwrite stored HTTP Basic credentials by sending crafted headers to the WordPress admin endpoint.
- 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-2026-89064?
CVE-2026-89064 is a medium-severity vulnerability in servmask All-in-One WP Migration and Backup, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The All-in-One WP Migration and Backup plugin for WordPress is vulnerable to Insufficient Credential Protection in versions up to, and including, 7.110. This is due to the `Ai1wm_Main_Controller::init()` method — registered on the `admin_init` hook, which fires unauthenticated on `admin-ajax.php` and `admin-post.php` requests — reading `$_SERVER['PHP_AUTH_USER']` and `$_SERVER['PHP_AUTH_PW']` from any incoming request and writing them to the `ai1wm_auth_header` option via `update_option()` as a reversible base64-encoded string, with no capability check, nonce verification, `is_user_logged_in()` check, or confirmation that Basic authentication actually succeeded. This makes it possible for unauthenticated attackers to capture into the database, in reversible base64 form, any WordPress Application Password or HTTP Basic credential presented to `/wp-admin/` by a legitimate integration, or to overwrite the stored credential with an attacker-chosen value by sending an anonymous request carrying a crafted `Authorization: Basic` header. This is particularly impactful in environments using WordPress Application Passwords for REST API or third-party integrations, as those credentials are transmitted as HTTP Basic auth to `/wp-admin/` and will be silently harvested via this unauthenticated write path.
Weakness: CWE-522
Which versions are affected by CVE-2026-89064?
How do I fix CVE-2026-89064?
No fix has been published for CVE-2026-89064 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-89064 being exploited?
There is no known exploitation of CVE-2026-89064 in the wild and no public exploit code.
Sources
Also known as GHSA-w3hh-7qrr-242f.