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5.4

WP-Optimize Plugin Allows Untrusted Users to Access Admin Functions

CVE-2026-2712
Summary

The WP-Optimize plugin for WordPress has a security issue that lets users with basic access levels perform actions reserved for administrators, such as accessing logs, deleting files, and modifying settings. This means that a malicious user could potentially cause harm to your site if they have access. You should update the WP-Optimize plugin to the latest version, 4.5.1 or higher, to fix this issue.

Original title
The WP-Optimize plugin for WordPress is vulnerable to unauthorized access of functionality due to missing capability checks in the `receive_heartbeat()` function in `includes/class-wp-optimize-hear...
Original description
The WP-Optimize plugin for WordPress is vulnerable to unauthorized access of functionality due to missing capability checks in the `receive_heartbeat()` function in `includes/class-wp-optimize-heartbeat.php` in all versions up to, and including, 4.5.0. This is due to the Heartbeat handler directly invoking `Updraft_Smush_Manager_Commands` methods without verifying user capabilities, nonce tokens, or the allowed commands whitelist that the normal AJAX handler (`updraft_smush_ajax`) enforces. This makes it possible for authenticated attackers, with Subscriber-level access and above, to invoke admin-only Smush operations including reading log files (`get_smush_logs`), deleting all backup images (`clean_all_backup_images`), triggering bulk image processing (`process_bulk_smush`), and modifying Smush options (`update_smush_options`).
nvd CVSS3.1 5.4
Vulnerability type
CWE-863 Incorrect Authorization
Published: 10 Apr 2026 · Updated: 10 Apr 2026 · First seen: 10 Apr 2026