CVE-2025-9353: Themify Builder WordPress Plugin XSS Flaw

CVE-2025-9353 Overview

CVE-2025-9353 is a Stored Cross-Site Scripting (XSS) vulnerability in the Themify Builder plugin for WordPress. The flaw affects all versions up to and including 7.6.9. It stems from insufficient input sanitization and output escaping across several plugin parameters, allowing authenticated users with Contributor-level access or above to inject arbitrary web scripts. Injected payloads execute in the browser of any user who visits an affected page. The vendor issued a partial patch in version 7.6.9, meaning administrators must apply follow-up fixes to fully remediate the issue.

Critical Impact
Authenticated contributors can persist JavaScript payloads on published pages, enabling session theft, administrative account takeover, and drive-by redirection against site visitors.

Affected Products

Themify Builder plugin for WordPress — all versions up to and including 7.6.9
WordPress sites running the plugin with Contributor-level or higher user registrations
Sites using the template-fancy-heading.php and template-icon.php templates shipped with the plugin

Discovery Timeline

2025-09-24 - CVE-2025-9353 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-9353

Vulnerability Analysis

The vulnerability is a Stored Cross-Site Scripting flaw categorized under [CWE-79]. Themify Builder accepts user-supplied values for several page-builder module parameters and writes them into rendered output without adequate sanitization or contextual escaping. Because Contributor accounts can author draft content that references these modules, low-privilege authenticated users can persist script payloads in the database. When an editor, administrator, or visitor loads a page containing the injected module, the browser executes the attacker-controlled script in the site's origin.

Wordfence tracks the issue in its Wordfence Vulnerability Report. The plugin author addressed part of the issue in changesets #3355757 and #3366817, but the fix is described as partial.

Root Cause

Several module templates render attribute and content values directly into HTML. Vulnerable rendering paths documented in the plugin source include the fancy heading template at lines 73 and 96, and the icon template at line 95. These paths emit builder parameters without applying esc_attr() or esc_html() to the values controlled by contributors. The editor-side JavaScript bundle referenced in the advisory does not restrict payload structure either.

Attack Vector

An authenticated attacker with Contributor privileges creates or edits a post that uses a vulnerable Themify Builder module. The attacker sets one of the affected parameters to a payload containing HTML event handlers or inline <script> content. When the post is previewed by a reviewer, published, or visited by an authenticated administrator, the payload executes in that user's session. Successful exploitation supports cookie theft, forced administrative actions via authenticated fetch calls, and redirection to attacker-controlled infrastructure.

No verified public proof-of-concept code is currently linked to this CVE. Refer to the Wordfence Vulnerability Report for additional technical detail.

Detection Methods for CVE-2025-9353

Indicators of Compromise

Themify Builder module content containing <script>, onerror=, onload=, or javascript: strings in post meta rows
Unexpected outbound requests from administrator browsers to unfamiliar domains shortly after previewing contributor drafts
New administrator or editor accounts created without corresponding audit-log activity from a known admin session
Unauthorized modifications to plugin, theme, or user records following contributor content submissions

Detection Strategies

Query the wp_postmeta table for Themify Builder payloads containing HTML event handlers or inline script tags
Review posts and pages authored or edited by Contributor and Author roles for embedded scripting in fancy heading and icon modules
Enable a Content Security Policy in report-only mode and monitor violation reports for inline script execution originating from /wp-content/plugins/themify-builder/templates/

Monitoring Recommendations

Alert on WordPress role changes, plugin installs, and administrator password resets initiated from unusual IPs
Monitor web server access logs for previews of contributor drafts followed immediately by privileged admin AJAX actions
Correlate browser telemetry from workstations used by editors and administrators with WordPress audit logs

How to Mitigate CVE-2025-9353

Immediate Actions Required

Update Themify Builder to the latest available version beyond 7.6.9, since 7.6.9 provides only a partial fix
Audit all Contributor, Author, and Editor accounts, remove unused accounts, and reset credentials for active reviewers
Inspect existing posts built with fancy heading and icon modules for injected script content and sanitize or remove affected posts
Enforce multi-factor authentication for all administrator and editor accounts to reduce the impact of session theft

Patch Information

The plugin author released partial fixes in WordPress plugin repository changesets #3355757 and #3366817. Because the advisory explicitly notes the patch in 7.6.9 is partial, administrators must track subsequent releases and apply the newest version. Confirm the installed version in the WordPress plugins dashboard after upgrading.

Workarounds

Temporarily restrict Contributor and Author role assignments until a complete patch is applied
Deploy a WordPress web application firewall rule that blocks HTML event handler patterns in Themify Builder module parameters
Disable the Themify Builder plugin on sites that do not require its page-building functionality until fully patched
Enforce a strict Content Security Policy that disallows inline script execution on public pages

bash

# Verify installed Themify Builder version and update via WP-CLI
wp plugin get themify-builder --field=version
wp plugin update themify-builder
wp plugin list --status=active --format=table