CVE-2026-11597 Overview
CVE-2026-11597 is a stored Cross-Site Scripting (XSS) vulnerability affecting the Surbma | Infusionsoft Shortcode plugin for WordPress. The flaw exists in the surbma_infusionsoft_shortcode_shortcode() function, which handles the infusionsoft-form shortcode. Insufficient input sanitization and output escaping on the account and id shortcode attributes allow authenticated users with contributor-level access or higher to inject arbitrary JavaScript into pages. The injected scripts execute in the browser of any visitor who loads the affected page. The vulnerability is classified under CWE-79 and impacts all plugin versions up to and including 2.0.1.
Critical Impact
Authenticated contributors can inject persistent JavaScript that executes against site administrators and visitors, enabling session theft, account takeover, and malicious redirection.
Affected Products
- Surbma | Infusionsoft Shortcode plugin for WordPress, versions up to and including 2.0.1
- WordPress sites permitting contributor-level or higher user registration
- Any WordPress installation with the vulnerable plugin active
Discovery Timeline
- 2026-06-27 - CVE-2026-11597 published to NVD
- 2026-06-29 - Last updated in NVD database
Technical Details for CVE-2026-11597
Vulnerability Analysis
The vulnerability resides in the surbma_infusionsoft_shortcode_shortcode() function within surbma-infusionsoft-shortcode.php. The function accepts two user-controlled shortcode attributes, account and id, and concatenates them directly into the src attribute of an HTML <script> tag without sanitization or escaping. Because WordPress allows users with the contributor role to embed shortcodes in post content, any authenticated user with that role or higher can craft a shortcode whose attributes break out of the src context and inject arbitrary JavaScript. The payload is stored persistently in the WordPress database and executes whenever an editor, administrator, or site visitor renders the affected page.
Root Cause
The root cause is missing input sanitization and output escaping on the account and id shortcode attributes. WordPress provides helper functions such as esc_attr() and esc_url() specifically to prevent this class of flaw, but the vulnerable code path uses raw attribute values in a script src. The relevant lines are documented in the plugin source at line 31 and line 35.
Attack Vector
An attacker with contributor-level privileges creates or edits a post containing the infusionsoft-form shortcode. The attacker supplies attribute values that terminate the src string and inject an executable JavaScript payload or reference to an attacker-controlled script. When the post is previewed or published, the malicious <script> tag renders in every visitor's browser. Consult the Wordfence CVE Vulnerability Report for additional technical detail.
Detection Methods for CVE-2026-11597
Indicators of Compromise
- Presence of infusionsoft-form shortcodes with unusual account or id attribute values containing quotes, angle brackets, or JavaScript keywords
- Unexpected <script> tags in rendered post HTML whose src attribute points to non-Infusionsoft domains
- Outbound browser requests from site visitors to unknown third-party JavaScript hosts
- Post revisions authored by contributor accounts that modify shortcode attributes
Detection Strategies
- Query the wp_posts table for post content matching the infusionsoft-form shortcode and inspect the account and id attribute values for injection payloads
- Review web server access logs for requests to pages containing the shortcode, correlated with outbound calls to unfamiliar domains
- Monitor WordPress user role changes and contributor account creation events that precede shortcode edits
Monitoring Recommendations
- Enable WordPress audit logging to capture post creation and edit events by low-privilege users
- Deploy Content Security Policy (CSP) headers that restrict permitted script sources and report violations
- Alert on new outbound domains referenced from rendered WordPress pages
How to Mitigate CVE-2026-11597
Immediate Actions Required
- Update the Surbma | Infusionsoft Shortcode plugin to a version later than 2.0.1 once available, per changeset 3581906 and changeset 3581936
- Audit all existing posts containing the infusionsoft-form shortcode and remove suspicious attribute values
- Review contributor and author accounts, disable any unused or suspicious accounts, and reset credentials for elevated users
Patch Information
The vendor addressed the vulnerability in changesets 3581906 and 3581936, published on the WordPress plugin repository. The fix adds sanitization and escaping to the account and id shortcode attributes before they are concatenated into the script src. Administrators should upgrade to the latest available version of the plugin.
Workarounds
- Deactivate and remove the Surbma | Infusionsoft Shortcode plugin until an updated version is installed
- Restrict contributor-level and higher accounts to trusted users only, and require multi-factor authentication for all editorial roles
- Enforce a strict Content Security Policy that blocks inline scripts and limits script-src to explicitly trusted domains
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
