CVE-2026-9290: WP User Manager Local File Inclusion Vulnerability

Technical summary

CVE-2026-9290 is a Local File Inclusion (LFI) vulnerability in the WP User Manager plugin's profile template scope function. The flaw stems from insufficient input validation when handling file paths, mapped to CWE-22 (Path Traversal). The attack vector is network-based, requires no authentication, no user interaction, and involves low complexity—an unauthenticated attacker can craft a malicious request to the affected function parameter to include arbitrary .php files from the server's filesystem. Once included, the PHP code executes in the context of the web application. The CVSS 3.1 vector (7.5/HIGH) reflects the high confidentiality impact and network accessibility, though integrity and availability are not directly affected by the inclusion itself. Severity escalates significantly if combined with a file upload vulnerability or if writable directories contain attacker-controlled files.

Business impact

WordPress site administrators and businesses relying on WP User Manager face direct risk of unauthorized data access and site compromise. An attacker can read sensitive configuration files (wp-config.php, database credentials), steal user information from the WordPress database, or execute arbitrary PHP to establish persistence, redirect users to phishing sites, or modify site content. For membership-based sites using this plugin for access control, the vulnerability entirely bypasses those controls. The low barrier to exploitation (no authentication required) and high prevalence of WordPress in small-to-medium business ecosystems amplifies the risk profile. Remediation requires immediate plugin updates and review of file permissions and upload directories.

Affected systems

All WordPress installations using the WP User Manager – User Profile Builder & Membership plugin up to and including version 2.9.17 are vulnerable. The plugin is designed for user profile management and membership functionality, making it attractive to multi-user sites, community portals, and membership-based businesses. Any site with this plugin active and exposed to the internet is at risk, regardless of other security measures, because the vulnerability requires no prior compromise or authentication.

Exploitability

Exploitability is high. The vulnerability requires only network access and no authentication, user interaction, or complex setup. An attacker can exploit it with a single HTTP request targeting the vulnerable profile template parameter. Public disclosure and the simplicity of the attack vector mean exploitation is feasible for opportunistic and targeted attackers alike. Threat actors commonly scan for outdated WordPress plugins, and this vulnerability's high-impact nature (code execution potential) makes it an attractive target. The lack of KEV listing does not diminish real-world risk; it indicates the vulnerability has not yet been formally confirmed in active exploitation campaigns tracked by CISA at the time of advisory publication.

Remediation

Site owners must immediately update the WP User Manager plugin to a patched version beyond 2.9.17. Verify the availability of a security patch from the plugin vendor before updating. Concurrently, review and restrict write permissions on web-accessible directories to prevent .php file uploads, implement a Web Application Firewall (WAF) rule to block path traversal patterns in plugin parameters, and audit upload directories for suspicious files. Consider temporarily disabling the plugin if a patch is unavailable and no workaround is suitable for your use case.

Patch guidance

Update WP User Manager to a version released after 2.9.17 that addresses this vulnerability. Check the official plugin repository or vendor advisory for the specific patched version number and release date. Test the update in a staging environment first to ensure compatibility with your theme and other plugins. After patching, verify that the plugin's profile template function properly sanitizes and validates file path inputs. If no patch is available at the time of reading, contact the plugin vendor for an estimated timeline or consider alternative user profile plugins.

Detection guidance

Monitor web server access logs for HTTP requests to the WP User Manager plugin directory (typically /wp-content/plugins/wp-user-manager/) targeting the profile template function parameter with suspicious payloads such as path traversal sequences (../, ..\) or attempts to include common sensitive files (wp-config.php, /etc/passwd). Implement WAF rules to detect and block requests containing path traversal or file inclusion patterns. Use WordPress security plugins (e.g., Wordfence, Sucuri) to audit plugin versions and flag outdated software. Conduct file integrity monitoring on .php files in web-accessible directories to detect unauthorized modifications or new files created post-exploitation.

Why prioritize this

This vulnerability merits immediate attention due to its combination of high CVSS score (7.5), unauthenticated network exploitability, and direct code execution potential. The profile template function is likely called on every user profile page view, increasing exposure. WordPress is one of the most targeted platforms globally, and plugin vulnerabilities are a primary attack vector for mass compromise. Even without active KEV listing, the simplicity and impact make this a high-priority patch target for security teams.

Risk score, explained

The CVSS 3.1 score of 7.5 reflects the following: Network Attack Vector (highest reach), Low Attack Complexity (no special conditions required), No Privileges Required (unauthenticated), No User Interaction, and Unchanged Scope. The high confidentiality impact (reading arbitrary files) drives the severity. The score does not directly account for integrity or availability impact because the LFI itself does not inherently modify or delete files—however, if combined with file upload capabilities, the real-world impact approaches critical. Organizations should treat this as a business-critical vulnerability requiring emergency response.

Frequently asked questions