CVE-2026-3546 in e-shot Plugin
Summary
by MITRE • 03/21/2026
The e-shot form builder plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 1.0.2. The eshot_form_builder_get_account_data() function is registered as a wp_ajax_ AJAX handler accessible to all authenticated users. The function lacks any capability check (e.g., current_user_can('manage_options')) and does not verify a nonce. It directly queries the database for the e-shot API token stored in the eshotformbuilder_control table and returns it along with all subaccount data as a JSON response. This makes it possible for authenticated attackers, with Subscriber-level access and above, to extract the e-shot API token and subaccount information, which could then be used to access the victim's e-shot platform account.
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Analysis
by VulDB Data Team • 03/21/2026
The vulnerability identified as CVE-2026-3546 affects the e-shot form builder plugin for WordPress, representing a critical security flaw that exposes sensitive data to authenticated users. This issue exists in all versions up to and including 1.0.2, making it a widespread concern for WordPress installations that utilize this plugin. The vulnerability stems from improper access controls within the plugin's AJAX handler implementation, specifically targeting the eshot_form_builder_get_account_data() function that processes administrative requests through the WordPress AJAX interface. The flaw demonstrates a classic lack of privilege verification that violates fundamental security principles for web application development.
The technical implementation of this vulnerability involves the eshot_form_builder_get_account_data() function being registered as a wp_ajax_ handler, which means it operates within WordPress's AJAX framework and can be invoked by authenticated users. This function fails to implement proper capability checks using WordPress's built-in permission system such as current_user_can('manage_options') which would typically restrict access to administrators only. Additionally, the function does not validate nonces, which are cryptographic tokens designed to prevent unauthorized requests and protect against cross-site request forgery attacks. The absence of these security measures creates a direct pathway for attackers to exploit the function's database query mechanism.
The operational impact of this vulnerability is significant as it allows authenticated attackers with Subscriber-level privileges or higher to extract sensitive API credentials and account information. When the vulnerable function executes, it directly queries the database table eshotformbuilder_control to retrieve the e-shot API token and associated subaccount data. This data is then returned in a JSON response format, making it easily consumable by attackers who can parse and utilize the extracted information. The exposure of API tokens creates a severe risk because these credentials can be used to gain unauthorized access to the victim's e-shot platform account, potentially leading to data breaches, unauthorized transactions, or further exploitation of the compromised system.
From a cybersecurity perspective, this vulnerability maps directly to CWE-284 (Improper Access Control) and CWE-312 (Sensitive Data Exposure) within the Common Weakness Enumeration framework. The lack of proper capability checks represents a clear violation of the principle of least privilege, while the direct exposure of API tokens constitutes sensitive data leakage. The attack pattern aligns with ATT&CK technique T1078 (Valid Accounts) and T1566 (Phishing) as attackers can leverage the compromised credentials to maintain persistent access or escalate privileges within the compromised WordPress environment. The vulnerability also reflects poor input validation and output encoding practices that are commonly addressed through secure coding guidelines and security development lifecycle frameworks.
The recommended mitigation strategy involves implementing proper access controls within the plugin's AJAX handler by adding capability checks to ensure only users with appropriate permissions can access the sensitive data retrieval functions. Additionally, all AJAX handlers should validate nonces to prevent unauthorized request execution and implement proper output sanitization to prevent information leakage. The plugin developers should also consider implementing rate limiting mechanisms to prevent brute force attempts to extract data through repeated requests. Users should immediately update to the patched version of the plugin if available, or implement temporary workarounds such as disabling the vulnerable AJAX endpoint until a proper security update is applied. Organizations should also monitor their WordPress installations for similar vulnerabilities and conduct regular security audits to identify and remediate access control flaws in third-party plugins and themes.