CVE-2026-10531 Overview
CVE-2026-10531 is a Stored Cross-Site Scripting (XSS) vulnerability in the AI Share & Summarize WordPress plugin. Versions prior to 2.0.4 fail to sanitize and escape several shortcode attributes before rendering them on the page. Authenticated users holding the Contributor role or higher can inject persistent JavaScript payloads that execute in the browsers of other site visitors, including administrators.
Critical Impact
Authenticated Contributors can inject persistent JavaScript that executes in other users' browsers, enabling session theft, content tampering, and administrator account takeover when privileged users view affected pages.
Affected Products
- AI Share & Summarize WordPress plugin versions prior to 2.0.4
- WordPress sites permitting Contributor-level (or higher) registrations
- WordPress installations exposing shortcode rendering to lower-privileged users
Discovery Timeline
- 2026-06-24 - CVE-2026-10531 published to NVD
- 2026-06-24 - Last updated in NVD database
Technical Details for CVE-2026-10531
Vulnerability Analysis
The vulnerability is a Stored Cross-Site Scripting flaw in the AI Share & Summarize plugin's shortcode handler. Shortcodes in WordPress accept attribute key-value pairs that authors include in post content. The plugin reads these attributes and writes them directly into the rendered HTML output without applying output encoding or sanitization.
Because Contributor accounts can author posts containing shortcodes, any user at that privilege level can embed crafted attribute values. When the affected post or page is viewed, the browser parses the unsanitized attribute content as HTML, executing any attacker-supplied script.
The attack requires user interaction, since a victim must load the page hosting the malicious shortcode. Privileged users such as Editors and Administrators reviewing draft submissions become high-value targets, as script execution in their session enables account takeover, plugin installation, and persistent backdoors.
Root Cause
The root cause is missing output escaping on shortcode attribute values. WordPress provides helper functions such as esc_attr() and esc_html() for safely rendering user-controlled data, but the affected plugin code path omits these calls before concatenating attributes into HTML.
Attack Vector
An attacker with Contributor access authors a post that uses the plugin's shortcode with a malicious attribute value containing HTML or JavaScript. After the post is published or previewed, any visitor to the page triggers execution of the injected script in the context of the WordPress site origin.
Technical details are documented in the WPScan Vulnerability Entry.
Detection Methods for CVE-2026-10531
Indicators of Compromise
- Posts or pages authored by Contributor-role users containing the plugin's shortcode with attribute values that include <script>, onerror=, onload=, or javascript: substrings.
- Unexpected outbound requests from administrator browsers to attacker-controlled domains shortly after viewing posts pending review.
- New administrator accounts, modified user roles, or unfamiliar plugin installations following review of Contributor submissions.
Detection Strategies
- Query the WordPress wp_posts table for shortcode attribute patterns containing HTML event handlers or script tags.
- Review web server access logs for requests to pages containing the affected shortcode that coincide with anomalous administrator sessions.
- Audit the plugin version reported in wp-content/plugins/ and flag any installation prior to version 2.0.4.
Monitoring Recommendations
- Enable logging of post creation and editing events by Contributor-role accounts and forward to a centralized log platform.
- Monitor for unexpected JavaScript execution patterns in browser telemetry from administrator workstations.
- Alert on changes to WordPress user roles, option values, and plugin/theme files following Contributor activity.
How to Mitigate CVE-2026-10531
Immediate Actions Required
- Update the AI Share & Summarize plugin to version 2.0.4 or later on every affected WordPress installation.
- Audit existing posts authored by Contributor-role accounts for malicious shortcode attribute content and remove suspicious entries.
- Review administrator and editor accounts for unauthorized changes, including new users, modified roles, and unexpected plugin installations.
Patch Information
The vendor addressed the issue in AI Share & Summarize version 2.0.4 by applying proper sanitization and escaping to shortcode attribute output. Site operators should upgrade through the WordPress plugin updater or by replacing plugin files with the patched release referenced in the WPScan Vulnerability Entry.
Workarounds
- Deactivate the AI Share & Summarize plugin until the patched version can be deployed.
- Restrict Contributor-level registrations and revoke the role from accounts that do not require authoring privileges.
- Deploy a Web Application Firewall (WAF) rule that blocks shortcode attribute payloads containing HTML tags or JavaScript event handlers.
- Configure a Content Security Policy (CSP) that restricts inline script execution to reduce the impact of stored XSS payloads.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
