CVE-2025-8147 Overview
CVE-2025-8147 is a missing authorization vulnerability in the LWSCache plugin for WordPress. The flaw resides in the lwscache_activatePlugin() function and affects all versions up to and including 2.8.5. Authenticated attackers with Subscriber-level access or higher can activate arbitrary whitelisted LWS plugins on the target site. The issue is tracked under CWE-285: Improper Authorization and was published to the National Vulnerability Database on August 29, 2025.
Critical Impact
Low-privilege authenticated users can trigger plugin activation workflows that should be restricted to administrators, expanding the attack surface on affected WordPress sites.
Affected Products
- LWSCache WordPress plugin versions up through 2.8.5
- WordPress sites that permit Subscriber-level registration with LWSCache installed
- LWS-family plugins reachable via the whitelisted activation path
Discovery Timeline
- 2025-08-29 - CVE-2025-8147 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-8147
Vulnerability Analysis
The LWSCache plugin exposes a function named lwscache_activatePlugin() that handles activation requests for a predefined set of LWS plugins. The function does not verify that the calling user holds the capability required to manage plugins. As a result, any authenticated session, including a Subscriber account, can invoke the handler and activate whitelisted plugins.
An attacker who successfully triggers the handler cannot install arbitrary plugins. The impact is bounded by the whitelist maintained inside the plugin. However, activating additional LWS-family plugins changes the loaded code paths on the site, which can introduce new functionality or new vulnerabilities that the site owner did not intend to enable.
According to the Common Vulnerability Scoring System vector, the attack requires network access and low privileges, needs no user interaction, and affects integrity only. Confidentiality and availability are not directly impacted by activation alone.
Root Cause
The root cause is a missing capability check inside the AJAX or admin-post handler for plugin activation. Standard WordPress practice requires calling current_user_can('activate_plugins') and verifying a nonce before performing privileged operations. The vulnerable version of lwscache.php reaches the activation branch without this authorization gate.
Attack Vector
Exploitation requires an authenticated session on the target WordPress site. The attacker sends a crafted request to the plugin's activation endpoint while authenticated as a Subscriber or higher role. Because the handler does not validate the caller's role, the request succeeds and activates the requested whitelisted plugin. See the WordPress plugin source listing for 2.8.5 and the fix changeset 3352047 for the exact code locations.
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Stop Identity AttacksDetection Methods for CVE-2025-8147
Indicators of Compromise
- Unexpected activation events for LWS-branded plugins recorded in the WordPress activate_plugin action log.
- Requests to the LWSCache AJAX endpoint originating from accounts holding only the Subscriber role.
- Entries in wp_options for active_plugins showing LWS plugins that administrators did not enable.
Detection Strategies
- Audit WordPress action and admin logs for calls to lwscache_activatePlugin tied to non-administrator user IDs.
- Compare the current active_plugins list against a known-good baseline and alert on deltas involving LWS plugins.
- Deploy a web application firewall rule that inspects POST bodies for the LWSCache action name and blocks the request when the session role is below Administrator.
Monitoring Recommendations
- Enable a WordPress audit logging plugin and forward events to a central log platform for correlation.
- Monitor new user registrations when open registration is enabled, because Subscriber accounts are the exploitation prerequisite.
- Track plugin file modification times and new plugin directory creation to catch downstream activity triggered by newly activated LWS plugins.
How to Mitigate CVE-2025-8147
Immediate Actions Required
- Update the LWSCache plugin to the version released in changeset 3352047, which is the first release containing the authorization fix.
- Review the site's current active_plugins list and deactivate any LWS plugin that was not intentionally enabled.
- Disable open user registration if it is not required, or restrict the default role to limit the pool of accounts that can reach the vulnerable handler.
Patch Information
The maintainers patched the vulnerability in the LWSCache release following version 2.8.5. The fix adds the required capability check inside lwscache_activatePlugin(). Refer to the Wordfence advisory for CVE-2025-8147 and the LWSCache plugin page for the fixed version and changelog.
Workarounds
- Temporarily deactivate the LWSCache plugin until the patched version is installed.
- Restrict access to /wp-admin/admin-ajax.php for Subscriber-level accounts using a web application firewall rule scoped to the LWSCache action.
- Audit and remove unused Subscriber accounts to reduce the number of sessions capable of invoking the handler.
# WP-CLI commands to inventory and update the affected plugin
wp plugin list --name=lwscache --fields=name,status,version
wp plugin update lwscache
wp plugin list --status=active | grep -i lws
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
