CVE-2026-76573 Overview
The Pods – Custom Content Types and Fields plugin for WordPress contains a Stored Cross-Site Scripting (XSS) vulnerability in the not_found shortcode attribute. The flaw affects all plugin versions up to and including 3.3.9.1. Insufficient input sanitization and output escaping in the shortcode handler allow authenticated users with contributor-level access or higher to inject arbitrary JavaScript into pages. Injected scripts execute in the browsers of any visitors who access an affected page. The issue is tracked as [CWE-79] and documented in the Wordfence Vulnerability Report.
Critical Impact
Authenticated contributors can persist JavaScript payloads that execute against every visitor, enabling session theft, forced administrative actions, and site defacement.
Affected Products
- Pods – Custom Content Types and Fields plugin for WordPress, all versions through 3.3.9.1
- WordPress sites permitting contributor-level or higher registration
- Multisite WordPress installations sharing the vulnerable plugin
Discovery Timeline
- 2026-09-05 - CVE-2026-76573 published to NVD
- 2026-09-08 - Last updated in NVD database
Technical Details for CVE-2026-76573
Vulnerability Analysis
The vulnerability resides in the shortcode processing logic exposed by the Pods plugin. The not_found attribute of a Pods shortcode is rendered back to the page without adequate sanitization or output escaping. An attacker with contributor privileges can embed a shortcode whose not_found attribute contains an HTML or JavaScript payload. When the post or page is rendered to any visitor, the browser interprets the payload as executable script. Because the payload is stored in the database and served to every viewer, this is a persistent stored XSS rather than a reflected variant. Relevant sinks are visible in the plugin source at PodsInit.php line 514 and general.php around lines 2535-2539.
Root Cause
The root cause is missing input sanitization on the shortcode attribute value combined with unescaped output during shortcode expansion. WordPress provides helper functions such as esc_html(), esc_attr(), and wp_kses() for this purpose, but the vulnerable code paths in includes/general.php emit the not_found value directly into HTML context. This maps to [CWE-79]: Improper Neutralization of Input During Web Page Generation.
Attack Vector
Exploitation requires an authenticated account with contributor-level access or above. The attacker creates or edits content that includes a Pods shortcode with a crafted not_found attribute containing JavaScript. When the shortcode's not-found branch is triggered during page render, the injected script executes in the visitor's session context. Higher-privileged victims, including administrators previewing content, can be targeted to hijack sessions, exfiltrate authentication cookies, or trigger administrative actions via forged requests.
No verified public exploit code is available. Refer to the vendor Pods Changeset for the corrective diff that introduces proper escaping.
Detection Methods for CVE-2026-76573
Indicators of Compromise
- Post or page content containing Pods shortcodes with not_found attribute values holding <script>, onerror, onload, or javascript: payloads
- Unexpected outbound requests from visitor browsers to attacker-controlled domains after loading Pods-rendered pages
- New or modified content authored by contributor accounts that includes shortcode attributes with HTML entities or encoded script fragments
Detection Strategies
- Query the wp_posts table for shortcode invocations matching patterns such as not_found="*<*" or not_found='*javascript*'
- Monitor web server access logs for responses from Pods-rendered URLs that return HTML containing inline event handlers not present in templates
- Enable a Content Security Policy (CSP) report-only header and alert on inline-script violations originating from pages that embed Pods shortcodes
Monitoring Recommendations
- Audit contributor and author account activity, especially post revisions that add or modify shortcodes
- Track plugin version inventory across WordPress hosts and flag any deployment running Pods 3.3.9.1 or earlier
- Correlate authentication events with content publication timelines to identify anomalous contributor behavior
How to Mitigate CVE-2026-76573
Immediate Actions Required
- Update the Pods plugin to the version published after 3.3.9.1 that includes the fix referenced in the Pods Changeset
- Review all existing posts and pages authored by contributor-level accounts for suspicious shortcode attributes
- Rotate session cookies and administrator credentials if injected payloads are discovered
Patch Information
The vendor addressed the flaw in the Pods plugin release following 3.3.9.1. The corrective changeset introduces proper escaping on the affected shortcode attribute output paths in includes/general.php. Consult the Wordfence Vulnerability Report for the specific fixed version and additional guidance.
Workarounds
- Restrict contributor-level and higher registrations and require administrator approval for new accounts if immediate patching is not possible
- Deploy a Web Application Firewall (WAF) rule that blocks shortcode attributes containing <script>, on*=, or javascript: tokens in POST bodies to WordPress editor endpoints
- Temporarily disable the Pods plugin on sites that cannot be updated and remove any Pods shortcodes from published content
# Example WP-CLI commands to inventory and update vulnerable installations
wp plugin list --name=pods --fields=name,status,version
wp plugin update pods
wp post list --post_status=publish --s='[pods' --format=ids
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
