CVE-2026-73386 in Track Geolocation Of Users Using Contact Form 7 Plugin
Summary
by MITRE • 08/19/2026
Unauthenticated Sensitive Data Exposure in Track Geolocation Of Users Using Contact Form 7 <= 3.0.2 versions.
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Analysis
by VulDB Data Team • 08/19/2026
The vulnerability identified as an unauthenticated sensitive data exposure within the Track Geolocation feature of the Contact Form 7 plugin, specifically affecting versions up to and including 3.0.2, represents a critical security flaw that compromises user privacy and organizational integrity. This issue stems from inadequate access controls on specific endpoints responsible for processing geolocation tracking requests. In typical web application architectures, features involving location data require strict authentication mechanisms to ensure that only authorized administrators or verified users can initiate or view such sensitive operations. However, in the affected versions of Contact Form 7, the endpoint handling these geolocation updates lacks proper verification checks, allowing any external actor with network connectivity to interact with it without providing valid credentials. This architectural oversight transforms a feature designed for legitimate analytics and user experience enhancement into an open channel for data exfiltration or reconnaissance activities.
From a technical perspective, the flaw is rooted in the absence of nonce validation and capability checks within the PHP handlers associated with the geolocation tracking functionality. When a request is made to update or retrieve location data via this endpoint, the server processes it based solely on the presence of specific parameters rather than verifying the identity or permissions of the requester. This design decision violates fundamental principles of secure software development, particularly regarding access control and input validation. The vulnerability allows attackers to send crafted HTTP requests that trigger the geolocation logic without authentication, potentially leading to unintended side effects such as logging false location data, disrupting legitimate tracking services, or exposing internal network topology if the server responds with detailed error messages containing path information. Furthermore, depending on how the backend integrates this data into user profiles or database records, it could facilitate broader attacks by correlating fake geolocation entries with real user accounts to build inaccurate behavioral models or disrupt audit trails.
The operational impact of this vulnerability is significant for organizations relying on Contact Form 7 for customer engagement and lead generation. By exploiting this flaw, an attacker can perform unauthorized actions that may degrade the reliability of location-based analytics used for marketing optimization or service delivery adjustments. More critically, if the application logic inadvertently exposes internal server responses or logs during processing errors, it could reveal sensitive infrastructure details such as database hostnames, file paths, or API keys embedded in configuration files accessed indirectly through error handling mechanisms. This aligns with CWE-209, which describes the generation of an error message that includes stack traces from code execution, potentially revealing sensitive information to attackers. Additionally, the ability to manipulate geolocation data without authorization falls under CWE-862, representing a missing authorization check, and can be leveraged in conjunction with other vulnerabilities for more complex attack chains, such as privilege escalation or account takeover if location data is used as part of multi-factor authentication logic or security questions.
In terms of threat modeling, this vulnerability maps directly to the ATT&CK technique T1078, Valid Accounts, although in this case it exploits the absence thereof by bypassing authentication entirely, which relates more closely to T1528 Steal Application Access Tokens if tokens were involved, but primarily fits within reconnaissance and initial access phases where attackers probe for misconfigured endpoints. The lack of input validation also touches upon CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component, although the primary issue is authentication bypass rather than injection per se. Attackers can automate exploitation using standard web scraping tools or custom scripts to send repeated requests to the vulnerable endpoint, potentially causing denial-of-service conditions through resource exhaustion if the geolocation processing involves heavy computational tasks like reverse-geocoding API calls. This could lead to service degradation for legitimate users and increased hosting costs due to excessive external API usage triggered by malicious actors.
Mitigation strategies must prioritize immediate remediation of the access control mechanisms governing the geolocation feature. The most effective solution is to upgrade Contact Form 7 to version 3.0.2 or later, where developers have implemented proper nonce verification and capability checks for all administrative actions involving sensitive data processing. For organizations unable to patch immediately due to compatibility constraints with other plugins or custom code modifications, temporary mitigations should include restricting access to the WordPress admin area via IP whitelisting using web application firewalls or server-level configurations such as .htaccess rules. Additionally, implementing rate limiting on all POST requests can help mitigate automated exploitation attempts by throttling excessive traffic from single source IPs. Security teams should also audit their deployment for any custom code that might have overridden default security behaviors introduced in newer versions of the plugin and ensure that error reporting is disabled or configured to show generic messages only to non-administrative users, thereby preventing information leakage through detailed stack traces. Regular vulnerability scanning and penetration testing focused on authentication bypasses are recommended to detect similar misconfigurations across other plugins and custom modules within the WordPress ecosystem.