CVE-2025-8482 Overview
The Simple Local Avatars plugin for WordPress contains a missing authorization vulnerability [CWE-862] affecting version 2.8.4. The migrate_from_wp_user_avatar() function lacks a capability check, allowing any authenticated user with subscriber-level access or higher to trigger avatar metadata migration for all users on the site. The flaw permits unauthorized modification of user metadata across the WordPress installation. While the impact is limited to integrity of avatar-related data, the low privilege requirement makes exploitation feasible in any environment that permits open registration.
Critical Impact
Authenticated attackers holding subscriber accounts can migrate avatar metadata for every user on the site, resulting in unauthorized data modification without administrative privileges.
Affected Products
- Simple Local Avatars plugin for WordPress, version 2.8.4
- WordPress sites permitting subscriber-level registration with the plugin enabled
- Environments that expose the migrate_from_wp_user_avatar() handler to authenticated users
Discovery Timeline
- 2025-08-12 - CVE CVE-2025-8482 published to the National Vulnerability Database (NVD)
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-8482
Vulnerability Analysis
The Simple Local Avatars plugin exposes a migration routine designed to import avatar data from the legacy WP User Avatar plugin. The migrate_from_wp_user_avatar() function performs bulk updates to user metadata but does not verify that the caller holds an administrative capability such as manage_options. Any authenticated request that reaches the migration handler will proceed, regardless of the caller's role.
The consequence is a broken access control condition. Subscribers, contributors, and other low-privilege accounts can invoke the routine and cause the plugin to iterate through all users and rewrite avatar metadata. The confidentiality of user data is not affected, and site availability remains intact, but data integrity is compromised for every account.
Root Cause
The root cause is a missing capability check inside the migration handler. WordPress plugins typically gate administrative actions with a current_user_can() call combined with a nonce verification. The vulnerable code path in class-simple-local-avatars.php omits the capability check, so authorization defaults to any logged-in session. See the WordPress Plugin Code File and the marked vulnerable lines for the specific implementation.
Attack Vector
Exploitation requires network access to the WordPress site and a valid authenticated session at subscriber level or higher. The attacker sends a crafted request to the endpoint that invokes the migration function. The plugin then executes the bulk metadata modification against all user accounts. No user interaction is required beyond the attacker's own authenticated request. The Wordfence Vulnerability Report documents the request flow and impact.
No public proof-of-concept exploit is currently available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.
Detection Methods for CVE-2025-8482
Indicators of Compromise
- Unexpected changes to the simple_local_avatar user meta key across multiple user accounts within a short time window
- HTTP POST or admin-ajax requests to the plugin migration handler originating from non-administrator sessions
- WordPress audit log entries showing bulk update_user_meta calls initiated by subscriber or contributor accounts
Detection Strategies
- Inventory WordPress installations to identify sites running Simple Local Avatars version 2.8.4 or earlier
- Enable a WordPress activity logging plugin to record user metadata modifications and the initiating user role
- Alert on any invocation of migration or import routines by non-administrative accounts
Monitoring Recommendations
- Monitor web server access logs for requests targeting plugin AJAX endpoints from newly registered subscriber accounts
- Review user registration patterns for spikes that may precede exploitation attempts
- Track integrity of the wp_usermeta table with periodic snapshots to detect unauthorized bulk modifications
How to Mitigate CVE-2025-8482
Immediate Actions Required
- Upgrade Simple Local Avatars to a version later than 2.8.4 that includes the capability check fix documented in the plugin changeset
- Audit existing user accounts and remove unused or suspicious subscriber-level registrations
- Review avatar metadata for signs of unauthorized modification and restore from backup if tampering is detected
Patch Information
The plugin maintainers addressed the missing authorization in a release following 2.8.4. Administrators should apply the update through the WordPress plugin management interface or via WP-CLI. Verify the installed version reports higher than 2.8.4 after the update completes.
Workarounds
- Disable open user registration by setting Anyone can register to off under WordPress general settings until the plugin is patched
- Temporarily deactivate the Simple Local Avatars plugin if an immediate update is not feasible
- Restrict access to wp-admin/admin-ajax.php at the web server or WAF layer for non-administrative accounts where operationally acceptable
# Update Simple Local Avatars via WP-CLI and verify the installed version
wp plugin update simple-local-avatars
wp plugin get simple-local-avatars --field=version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
