highCVE-2026-13353

WP Ultimate CSV Importer <= 8.0.1 - Missing Authorization to Authenticated (Subscriber+) Remote Code Execution via 'MappedFields' Parameter

Q: What is affected by CVE-2026-13353?

WP Ultimate CSV Importer – WordPress Import & Export for CSV, XML & Excel versions listed as affected should be reviewed: *-8.0.1.

Q: What should I fix first?

Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.

Q: How do I confirm the fix worked?

Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.

Q: How are Fixnx security risk categories chosen?

Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.

The WP Ultimate CSV Importer – WordPress Import & Export for CSV, XML & Excel plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 8.0.1 via the 'MappedFields' parameter. This is due to missing capability checks on the AJAX handlers for install_addon, saveMappedFields, and StartImport, combined with the plugin nonce being exposed to any authenticated user who can load an admin page, allowing a Subscriber to install the Import WooCommerce add-on, persist attacker-controlled PHP expressions in the MappedFields parameter, and trigger evaluation via eval() in ImportHelpers::get_meta_values(). This makes it possible for authenticated attackers, with subscriber-level access and above, to execute code on the server.

ProductWP Ultimate CSV Importer – WordPress Import & Export for CSV, XML & Excel

CVSS8.8

EPSS0.00606

UpdatedJuly 13, 2026

Quick answer

WP Ultimate CSV Importer – WordPress Import & Export for CSV, XML & Excel should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.

Who is affected

Affected versions

*-8.0.1

Fixed versions

How to fix it

WP Ultimate CSV Importer – WordPress Import & Export for CSV, XML & Excel is affected by CVE-2026-13353, a authorization bypass issue in versions up to 8.0.1. Wordfence lists the official remediation as updating to version 8.1, or a newer patched version. Prioritize internet-facing WordPress sites, sites with public registration, customer portals, WooCommerce checkout/account flows, and admin workflows where the vulnerable feature is enabled. If immediate patching is not possible, disable the affected plugin or vulnerable feature, restrict access, and monitor for exploitation until the update is installed.

Inventory every WordPress site that has WP Ultimate CSV Importer – WordPress Import & Export for CSV, XML & Excel installed, including staging, multisite, client, and WooCommerce environments.
Confirm the installed WP Ultimate CSV Importer – WordPress Import & Export for CSV, XML & Excel version and compare it with the affected range from the Wordfence advisory.
Update WP Ultimate CSV Importer – WordPress Import & Export for CSV, XML & Excel to version 8.1, or to a newer vendor-supported patched version from the official WordPress update channel.
If the update cannot be applied immediately, disable WP Ultimate CSV Importer – WordPress Import & Export for CSV, XML & Excel or the affected feature and restrict access with roles, authentication, WAF rules, or temporary route blocking.
Review affected REST endpoints, AJAX actions, roles, capabilities, orders, appointments, account records, and payment or status changes for unauthorized activity.
Rotate administrator sessions, API keys, webhook secrets, and integration tokens if logs or content review suggest compromise.
Clear WordPress, object, CDN, page-builder, and browser caches after patching so vulnerable assets or stored payloads are not served.

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Verify the fix

Confirm the running WP Ultimate CSV Importer – WordPress Import & Export for CSV, XML & Excel version is version 8.1 or newer, and record the patched version in the remediation ticket.
Verify unauthenticated or low-privilege users can no longer trigger the affected action, endpoint, payment, appointment, account, or settings change.
Review web server, WordPress, security plugin, WAF, and application logs for exploitation attempts before and after the fix.
Retest normal user, admin, checkout, form, API, or integration workflows to confirm the update did not break expected behavior.
Run a fresh Fixnx scan and document the public exposure state, patched version, log review, and any cleanup evidence.

Related categories

WordPress WooCommerce PHP Remote Code Execution Authorization Bypass

Trusted references

Wordfence advisoryWordfence, NVD Source advisoryWordfence, NVD Source advisoryWordfence, NVD Source advisoryWordfence, NVD Source advisoryWordfence, NVD Source advisoryWordfence, NVD Source advisoryWordfence, NVD Wordfence advisoryWordfence, NVD

FAQ

What is affected by CVE-2026-13353?

WP Ultimate CSV Importer – WordPress Import & Export for CSV, XML & Excel versions listed as affected should be reviewed: *-8.0.1.

What should I fix first?

Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.

How do I confirm the fix worked?

Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.

How are Fixnx security risk categories chosen?

Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.