CVE-2026-103336 Overview
CVE-2026-103336 is a sensitive data exposure vulnerability in the Smackcoders WP Ultimate CSV Importer plugin for WordPress. The flaw affects all versions up to and including 9.1. An unauthenticated remote attacker can retrieve embedded sensitive information from server responses without any user interaction. The weakness is classified under [CWE-201: Insertion of Sensitive Information Into Sent Data].
Critical Impact
Unauthenticated network attackers can extract sensitive information from affected WordPress sites running wp-ultimate-csv-importer 9.1 or earlier, enabling reconnaissance and follow-on attacks.
Affected Products
- Smackcoders WP Ultimate CSV Importer (wp-ultimate-csv-importer) WordPress plugin
- All versions from n/a through 9.1
- WordPress sites with the plugin installed and activated
Discovery Timeline
- 2026-10-01 - CVE-2026-103336 published to NVD
- 2026-10-01 - Last updated in NVD database
Technical Details for CVE-2026-103336
Vulnerability Analysis
The plugin inserts sensitive information into data sent to clients, allowing unauthorized retrieval of embedded data. The issue is network-exploitable, requires no authentication, and needs no user interaction. The confidentiality impact is limited to information disclosure; integrity and availability are not affected.
Attackers can issue crafted HTTP requests to plugin endpoints and parse responses for exposed data. Because the plugin handles CSV import workflows, exposed material may include configuration metadata, internal paths, user-supplied content, or import job details that aid further exploitation.
Root Cause
The root cause is improper filtering of sensitive information before transmission in HTTP responses, consistent with [CWE-201]. The plugin returns data in server responses that should either be redacted, access-controlled, or omitted entirely for unauthenticated requests. Smackcoders addresses the issue in versions after 9.1.
Attack Vector
Exploitation occurs remotely over the network against a vulnerable WordPress site. An attacker sends unauthenticated HTTP requests to plugin-exposed endpoints and inspects the responses for embedded sensitive values. No privileges, user interaction, or local access are required. For technical specifics, consult the Patchstack Vulnerability Report.
Detection Methods for CVE-2026-103336
Indicators of Compromise
- Repeated unauthenticated HTTP requests to /wp-content/plugins/wp-ultimate-csv-importer/ paths or related REST endpoints from a single source
- Anomalous response sizes from plugin endpoints suggesting data retrieval
- Access patterns from scanners enumerating WordPress plugin versions
Detection Strategies
- Review web server access logs for requests to wp-ultimate-csv-importer endpoints originating from unauthenticated sessions
- Deploy WordPress plugin inventory tooling to identify sites running wp-ultimate-csv-importer version 9.1 or earlier
- Correlate outbound responses from plugin endpoints with known sensitive data patterns such as internal IDs, paths, or configuration values
Monitoring Recommendations
- Enable WAF logging for all requests targeting WordPress plugin paths and alert on high request rates
- Monitor for enumeration behavior preceding targeted plugin requests
- Track plugin version drift across managed WordPress fleets using asset inventory tools
How to Mitigate CVE-2026-103336
Immediate Actions Required
- Identify all WordPress instances running wp-ultimate-csv-importer and determine installed versions
- Upgrade the plugin to the latest version released after 9.1 that remediates CVE-2026-103336
- If no patched version is available, deactivate and remove the plugin until a fix ships
Patch Information
Smackcoders addresses the vulnerability in releases after version 9.1. Administrators should consult the Patchstack Vulnerability Report and the plugin's WordPress.org changelog to confirm the fixed version before deploying.
Workarounds
- Restrict access to the plugin's endpoints at the web server or WAF layer using IP allowlists for administrator networks
- Place the WordPress admin area behind authenticated reverse proxy controls or a VPN
- Apply virtual patching rules in a WAF to block unauthenticated requests to known plugin paths until the official fix is applied
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
