All-in-One WP Migration Unlimited Extension <= 2.83 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Backup Schedule Creation and Backup File Download
Strategic Overview
- Status
- Patched in 2.84
- Affected Plugin
- All-in-One WP Migration Unlimited Extension
- Affected Version
<= 2.83- CVSS
- 6.5Medium
- Weakness type
- CWE-862 · Missing Authorization
- CVE
CVE-2026-5753
At a glance
CVE-2026-5753 is a medium-severity Missing Authorization vulnerability in the All-in-One WP Migration Unlimited Extension WordPress plugin, affecting versions <= 2.83. It carries a CVSS score of 6.5 (reachable over the network; low attack complexity; high confidentiality impact). Exploitation requires an authenticated account at Subscriber level or above. The issue is fixed in version 2.84; sites on affected versions should update now. Disclosed May 2026, reported by Sélim Lanouar (whattheslime).
Vulnerability Overview
The All-in-One WP Migration Unlimited Extension plugin for WordPress is vulnerable to Missing Authorization in versions up to, and including, 2.83. This is due to the 'Ai1wmve_Schedules_Controller::save' handler for 'admin_post_ai1wm_schedule_event_save' not verifying user capabilities before saving schedule data. This makes it possible for authenticated attackers, with subscriber-level access and above, to create scheduled export jobs and send backup notifications to attacker-controlled email addresses. Because such notifications include the random backup filename, full site backups can subsequently be downloaded from the target site, resulting in sensitive information exposure.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user. A successful exploit has high impact on confidentiality.
CWE-862: Missing Authorization
All-in-One WP Migration Unlimited Extension <= 2.83 carries this weakness at admin_post_ai1wm_schedule_event_save, and reaching it takes an account at Subscriber level or above. A missing authorization check means a function is reachable by anyone who can reach the endpoint, because the code never asks whether the caller is allowed to perform the action.
Any user who can reach the endpoint gets to run an action reserved for higher-privileged roles, from reading protected data to changing settings or content. For All-in-One WP Migration Unlimited Extension the fix is 2.84: builds <= 2.83 are affected, anything from 2.84 onward is not.
Remediation
Update to version 2.84, or a newer patched version
How does WordSec protect against this?
Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: All-in-One WP Migration Unlimited Extension 2.84 closes this, and updating the plugin is the step that ends it.
- Login Security
- Alerts
External References
Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C