CVE-2026-10531: AI Share & Summarize WordPress Plugin Stored XSS Vulnerability

Technical summary

CVE-2026-10531 is a Stored XSS vulnerability in the AI Share & Summarize WordPress plugin prior to version 2.0.4. The plugin's shortcode handler fails to sanitize and escape specific attributes before outputting them into page markup. An attacker with Contributor role or above can craft a malicious shortcode with unescaped payloads that execute in the context of page rendering. Since the payload is stored in the database, it affects all users who view the compromised page. The vulnerability requires user interaction (page visit) and operates across site context boundaries, though the impact is limited to information disclosure and minor integrity issues rather than full site compromise.

Business impact

For WordPress site operators, this vulnerability creates a persistent XSS threat primarily from insider threats or compromised contributor accounts. An attacker could deface content, steal session cookies, redirect users, or harvest form data from site visitors. Multi-author blogs, editorial platforms, and collaborative WordPress sites face the highest risk. Since the attack requires prior authentication as a Contributor or Editor, the business impact depends on your access control posture—sites with overly permissive role assignments face greater exposure. Successful exploitation damages site trustworthiness and visitor confidence.

Affected systems

The AI Share & Summarize WordPress plugin is affected in all versions before 2.0.4. Impact is limited to WordPress installations with this plugin active. Sites where only Administrators have content creation permissions face lower risk; sites with many Contributor-level users or guest authors face elevated risk. The vulnerability does not affect WordPress core, other plugins, or installations without this specific plugin.

Exploitability

Exploitation requires an authenticated attacker with at least Contributor-level WordPress role. No network privileges or special system access is needed beyond valid login credentials. The attack is relatively straightforward—injecting malicious JavaScript into a shortcode attribute—but the attacker must know which shortcode attributes are vulnerable. The vulnerability has a CVSS score of 5.4 (Medium severity) reflecting the requirement for authentication and user interaction, though the persistent nature of stored XSS makes it more dangerous than reflected XSS variants. The vulnerability is not listed on CISA's Known Exploited Vulnerabilities catalog, suggesting limited real-world exploitation at publication.

Remediation

Update the AI Share & Summarize WordPress plugin to version 2.0.4 or later. This version includes proper input sanitization and output escaping of shortcode attributes. Site administrators should verify the update has been applied and consider auditing recent post and page revisions for malicious shortcodes, particularly those edited by Contributor-level accounts. For sites unable to immediately update, temporarily disable the plugin or restrict Contributor role permissions to trusted users only.

Patch guidance

The patch is available in AI Share & Summarize plugin version 2.0.4 and later. Update through the WordPress plugin dashboard or by downloading directly from the official plugin repository. Apply updates in a testing environment first to verify compatibility with your theme and other plugins. After patching, clear any cached versions of affected pages to ensure the malicious content is not served from cache. Review the plugin's changelog to confirm the sanitization fixes are included.

Detection guidance

Review WordPress posts and pages edited by Contributor-level accounts after the plugin's initial installation and before the update date. Search page content for unexpected JavaScript, particularly within shortcodes. Monitor WordPress revision history for changes made by user accounts other than administrators. Check server logs for unusual POST requests to wp-admin/post.php with malicious-looking shortcode parameters. Use WordPress security plugins to scan for XSS patterns in stored content. Audit active user roles and remove Contributor permissions from users who no longer require them.

Why prioritize this

While the CVSS score is Medium (5.4), prioritize this vulnerability if your WordPress installation uses the AI Share & Summarize plugin and grants Contributor or Editor roles to multiple users or external authors. The stored nature of the XSS makes it persistent and affects all site visitors, not just the attacker. If your site restricts content creation to administrators only, the risk is substantially lower but not eliminated if an admin account is compromised. Apply the patch within your normal security maintenance window.

Risk score, explained

The CVSS v3.1 score of 5.4 reflects a Medium severity classification. The score accounts for low attack complexity (simple shortcode injection), required authentication (Contributor role minimum), limited confidentiality and integrity impact (cookie theft, minor defacement), and no availability impact. The score does not fully capture the persistent nature of stored XSS, which elevates practical risk compared to reflected XSS. User interaction is required (visiting the compromised page), and the attack is confined to the application context rather than system-wide, both of which lower the numeric score.

Frequently asked questions