CVE-2026-79631 in WPFunnels Plugin
Summary
by MITRE • 09/04/2026
The WPFunnels WordPress plugin before 3.13.0 does not restrict access to the log files it writes to a predictable location under the public uploads directory, allowing unauthenticated users to download customer order details and opt-in form submissions when logging is enabled.
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Analysis
by VulDB Data Team • 09/04/2026
The vulnerability identified in WPFunnels versions prior to 3.13.0 represents a critical failure in access control mechanisms for sensitive data storage within WordPress environments. This plugin, widely used by e-commerce businesses to manage sales funnels and customer journeys, stores operational logs containing highly confidential information such as customer order details and opt-in form submissions. The core technical flaw lies in the predictable file naming convention and location of these log files, which are written directly into the public uploads directory without implementing appropriate access restrictions or authentication checks for retrieval requests. Because WordPress serves static files from this directory by default to improve performance, any user with knowledge of the specific path structure can construct a direct URL request to download these logs. This behavior effectively bypasses standard WordPress security layers that typically protect administrative data and private content, exposing raw log contents to unauthenticated visitors on the internet.
From an industry standards perspective, this vulnerability is classified under CWE-200 as Exposure of Sensitive Information to an Unauthorized Actor. The root cause aligns with CWE-538, which addresses file inclusion or exposure issues where files containing sensitive data are accessible via a web browser without proper authentication. Furthermore, in the context of the MITRE ATT&CK framework for enterprise security, this flaw facilitates reconnaissance and information gathering activities. Attackers can leverage this access to collect personally identifiable information (PII), financial transaction records, and marketing consent data, which supports subsequent phases such as credential stuffing or targeted phishing campaigns using harvested customer details. The predictability of the file path significantly lowers the barrier for exploitation, allowing automated scripts to scan multiple WordPress installations rapidly by guessing common log file names associated with popular plugins like WPFunnels.
The operational impact of this vulnerability is severe due to the nature of the data exposed. Customer order details often include full names, shipping addresses, email addresses, and potentially partial payment information depending on how logs are configured. Opt-in form submissions may contain additional personal preferences or contact methods that users expect to remain private under privacy regulations such as GDPR or CCPA. The exposure of this data not only compromises individual user privacy but also exposes the organization to significant legal liability, reputational damage, and potential regulatory fines. For businesses relying on WPFunnels for their sales infrastructure, a successful exploitation could lead to direct financial loss through fraud if payment details are exposed, as well as long-term erosion of customer trust when sensitive data becomes publicly available via simple HTTP requests.
Mitigation strategies must address both immediate remediation and future prevention measures. The primary solution is to upgrade the WPFunnels plugin to version 3.13.0 or later, where developers have implemented proper access controls to restrict log file retrieval to authenticated administrators only. For organizations unable to update immediately due to compatibility constraints, a temporary workaround involves modifying server configuration files such as .htaccess for Apache servers or nginx.conf for Nginx servers to deny public access to the specific directory path used by WPFunnels logs. Additionally, disabling verbose logging in the plugin settings can reduce the volume of sensitive data written to disk if detailed audit trails are not strictly required for operational purposes. Security teams should also conduct a thorough scan of their WordPress installations using vulnerability scanners configured to detect predictable file exposure patterns and ensure that all plugins are kept up-to-date with security patches released by vendors. Regular audits of public-facing directories and implementation of strict Content Security Policies can further mitigate the risk of similar information disclosure vulnerabilities in other components of the web application stack.