CVE-2026-103336 in WP Ultimate CSV Importer Plugin
Summary
by MITRE • 10/01/2026
Insertion of Sensitive Information Into Sent Data vulnerability in Smackcoders Inc. WP Ultimate CSV Importer wp-ultimate-csv-importer allows Retrieve Embedded Sensitive Data.This issue affects WP Ultimate CSV Importer: from n/a through 9.1.
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Analysis
by VulDB Data Team • 10/01/2026
The vulnerability identified within the WP Ultimate CSV Importer plugin, specifically affecting versions up to and including 9.1 developed by Smackcoders Inc., represents a critical failure in data handling practices that leads to the exposure of sensitive information embedded within processed files. This flaw is categorized under CWE-200 as an Information Exposure vulnerability, where security-sensitive information such as credentials, personal identifiable information, or internal system configurations are inadvertently disclosed through normal application operations. The core technical issue stems from how the plugin processes uploaded CSV and other delimited text files during import routines. When a user uploads a file containing specific data structures, the software fails to adequately sanitize or mask sensitive fields before they are rendered in the administrative interface or stored in database tables that may be accessible via unintended vectors. This lack of proper input validation and output encoding allows attackers who have gained access to the WordPress administration panel, or potentially lower-privileged users depending on configuration, to view data that was intended for internal processing only.
From an operational perspective, this vulnerability enables a Retrieve Embedded Sensitive Data attack scenario as defined by MITRE ATT&CK technique T1087. An attacker leveraging this flaw can extract confidential information directly from the imported datasets without needing complex exploitation chains or privilege escalation beyond what is required to access the import functionality. The impact extends beyond simple data leakage; it compromises the integrity and confidentiality of the organization's data ecosystem. If the CSV files contain user credentials, API keys, financial records, or health-related data protected by regulations such as GDPR or HIPAA, this exposure can lead to severe legal consequences, reputational damage, and further compromise through credential stuffing attacks if passwords are exposed in plaintext within the imported content. The vulnerability is particularly dangerous because it exploits a trusted administrative function, making detection difficult for standard security monitoring tools that do not inspect payload contents during routine import operations.
Mitigation strategies must focus on immediate remediation of the software version alongside enhanced data handling protocols. Administrators should update WP Ultimate CSV Importer to the latest patched version released by Smackcoders Inc., which addresses these sanitization gaps in its processing engine. In cases where an upgrade is not immediately feasible, temporary mitigations include restricting access to the import functionality to only highly privileged administrators and implementing strict file type validation on the server side to prevent execution of malicious scripts embedded within CSV files. Additionally, organizations should audit their data handling policies to ensure that sensitive information is never included in bulk upload files unless absolutely necessary, and if it must be present, it should be encrypted or hashed before import. Regular security assessments and penetration testing focused on file upload mechanisms are recommended to identify similar weaknesses across the web application stack.