CVE-2024-11088 Overview
CVE-2024-11088 affects the Simple Membership plugin for WordPress in all versions up to and including 4.5.5. The plugin fails to properly restrict protected post content from the WordPress core search feature. Unauthenticated attackers can query the search endpoint to extract content from posts restricted to higher-privilege roles such as administrator. The flaw maps to [CWE-200] Information Exposure and [CWE-276] Incorrect Default Permissions. The vendor addressed the issue in plugin changeset 3190023.
Critical Impact
Unauthenticated remote attackers can retrieve sensitive content from membership-protected and admin-restricted posts through the WordPress search feature without authentication or user interaction.
Affected Products
- Simple Membership plugin for WordPress, all versions through 4.5.5
- WordPress sites using membership-tiered content restrictions
- Sites relying on Simple Membership to gate administrator-only posts
Discovery Timeline
- 2024-11-21 - CVE-2024-11088 published to NVD
- 2025-04-05 - Last updated in NVD database
Technical Details for CVE-2024-11088
Vulnerability Analysis
The Simple Membership plugin enforces access control on direct post views but does not filter results returned by the WordPress core search query. When a visitor submits a search request, WordPress queries the database and renders matching post excerpts. The plugin omits a filter on pre_get_posts or the search results loop that would exclude restricted content from unauthenticated users.
Attackers exploit this gap by issuing crafted search queries against the target site. The search response leaks excerpts, titles, and partial body content from posts intended only for administrators or paying members. No credentials, tokens, or social engineering are required to trigger the leak.
The vulnerability is classified under [CWE-200] Sensitive Information Exposure and [CWE-276] Incorrect Default Permissions. Confidentiality impact is high while integrity and availability are unaffected.
Root Cause
The root cause is missing authorization enforcement in the search query path. The plugin restricts the standard single-post view through template-level checks but does not apply equivalent filtering to WP_Query results generated by the search endpoint. Content intended to remain private is therefore indexed and returned in search responses to any visitor.
Attack Vector
Exploitation is performed over the network using standard HTTP requests. An attacker browses to the target WordPress site and submits queries through the built-in search form or directly via ?s=<term> URL parameters. Iterative searches across common keywords allow enumeration of restricted post content without authentication.
The vulnerability mechanism is straightforward and does not require crafted payloads or exploitation tooling. See the Wordfence Vulnerability Report for additional technical context.
Detection Methods for CVE-2024-11088
Indicators of Compromise
- High volume of unauthenticated requests to /?s= search endpoints from a single source IP
- Search query parameters containing dictionary terms or sequential keyword enumeration
- Web server access logs showing search requests followed by no subsequent post view requests
- Requests originating from automated user agents or headless browsers against the search endpoint
Detection Strategies
- Audit Simple Membership plugin version across all WordPress instances and flag deployments at or below 4.5.5
- Review WordPress access logs for anomalous search query patterns over short time windows
- Compare search-engine indexed pages against expected public content to identify leaked restricted posts
Monitoring Recommendations
- Alert on burst patterns of search requests from unauthenticated sessions exceeding baseline thresholds
- Monitor web application firewall logs for repeated s= parameter queries from non-browser clients
- Track outbound search engine crawler indexing of URLs that should be restricted by membership rules
How to Mitigate CVE-2024-11088
Immediate Actions Required
- Update the Simple Membership plugin to the version released in changeset 3190023 or later
- Inventory all WordPress sites running Simple Membership and prioritize patching internet-facing installations
- Review search engine indexes for cached copies of restricted content and request removal where applicable
Patch Information
The vendor released a fix in WordPress Plugin Changeset 3190023. Administrators should upgrade through the WordPress plugin manager or apply the changeset directly. Verify the running plugin version after upgrade to confirm the patched release is active.
Workarounds
- Disable the WordPress core search feature on sites that rely on Simple Membership for content restriction until the patch is applied
- Add a custom pre_get_posts filter that excludes membership-protected post types from search results
- Restrict access to the search endpoint at the web application firewall or reverse proxy layer for unauthenticated requests
# Example WP-CLI command to update the plugin to the patched version
wp plugin update simple-membership --version=latest
wp plugin get simple-membership --field=version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
