CVE-2026-19719 Overview
CVE-2026-19719 is a Stored Cross-Site Scripting (XSS) vulnerability in the Social Media Share Buttons & Social Sharing Icons WordPress plugin before version 3.0.1. The plugin fails to escape the post title before rendering it inside an inline JavaScript event handler. Authenticated users with the Contributor role or higher can inject arbitrary JavaScript into post titles. The payload executes when a site visitor interacts with the affected share button. Exploitation requires the plugin to be running a non-default icon display configuration [CWE-79].
Critical Impact
Contributor-level users can plant persistent JavaScript that runs in visitor and administrator browsers, enabling session theft, account takeover, and further compromise of the WordPress site.
Affected Products
- Social Media Share Buttons & Social Sharing Icons WordPress plugin versions prior to 3.0.1
- WordPress sites using the plugin with a non-default icon display configuration
- WordPress installations that permit Contributor-role accounts
Discovery Timeline
- 2026-09-02 - CVE-2026-19719 published to NVD
- 2026-09-02 - Last updated in NVD database
Technical Details for CVE-2026-19719
Vulnerability Analysis
The plugin outputs the WordPress post title directly inside an inline JavaScript event handler attribute without applying context-appropriate escaping. When the plugin renders share buttons in a non-default icon display configuration, the post title is embedded within an HTML attribute that contains executable JavaScript. Any single or double quote, angle bracket, or JavaScript syntax in the title breaks out of the attribute context and executes in the visitor's browser.
Because post titles are stored in the database, the injected payload persists across page loads and affects every visitor who interacts with the button. The XSS runs in the origin of the vulnerable WordPress site, giving attackers access to session cookies, the WordPress REST API, and administrative functions if a logged-in administrator triggers the payload.
Root Cause
The plugin concatenates the raw post title into inline JavaScript handler markup without using esc_js() or esc_attr(). WordPress core provides context-aware escaping helpers, but the plugin relies on the default HTML output path that is not safe for JavaScript string contexts. This is a classic output-encoding failure classified under [CWE-79].
Attack Vector
An attacker needs a Contributor account or higher on the target WordPress site. The attacker creates or edits a post and places a crafted payload in the title field that closes the surrounding attribute and injects JavaScript. Once the post is published or previewed on a page containing the share buttons, any visitor who clicks or hovers over the affected button triggers the stored payload. The site must be running a non-default icon display configuration for the vulnerable code path to render.
See the WPScan Vulnerability Report for additional technical details.
Detection Methods for CVE-2026-19719
Indicators of Compromise
- Post titles in wp_posts containing HTML control characters such as ", ', <, >, or javascript: sequences
- Unexpected <script> tags or on* event handlers rendered in the share-button block of published pages
- Outbound requests from visitor browsers to attacker-controlled domains originating from the share-button DOM elements
- New administrator accounts or modified user roles following Contributor account activity
Detection Strategies
- Audit the plugin version installed across all managed WordPress sites and flag any instance below 3.0.1
- Query the WordPress database for post titles containing script tags, event handlers, or attribute-breaking characters
- Review web server access logs for POST requests to /wp-admin/post.php from Contributor-role accounts followed by anomalous JavaScript execution on public pages
- Inspect rendered HTML of pages hosting the share buttons for malformed attribute syntax
Monitoring Recommendations
- Enable Content Security Policy (CSP) headers to log or block inline script execution and report violations to a central collector
- Forward WordPress audit logs and web server logs to a centralized data lake for correlation of Contributor activity with client-side alerts
- Alert on creation of new WordPress users with elevated roles, especially shortly after suspicious post edits
How to Mitigate CVE-2026-19719
Immediate Actions Required
- Update the Social Media Share Buttons & Social Sharing Icons plugin to version 3.0.1 or later on every WordPress site
- Review all posts authored by Contributor-role users for malicious content in titles and revert or sanitize affected entries
- Rotate credentials and invalidate active sessions for any WordPress administrator who may have loaded a compromised page
- Audit user role assignments and remove Contributor accounts that are no longer needed
Patch Information
The vendor released version 3.0.1 of the plugin, which applies proper escaping to the post title before it is rendered inside inline JavaScript event handlers. Refer to the WPScan Vulnerability Report for the fixed version reference.
Workarounds
- Switch the plugin back to its default icon display configuration, which does not render the vulnerable inline JavaScript handler
- Restrict the Contributor role or require editorial review of post titles before publication
- Deploy a web application firewall (WAF) rule that blocks post-title submissions containing HTML or JavaScript metacharacters
- Disable the plugin until patching is complete if share buttons are not business-critical
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.