Stored XSS in jQuery Googleslides WordPress Plugin

Executive Summary

The jQuery googleslides plugin for WordPress is vulnerable to Stored Cross-Site Scripting (XSS) via the 'googleslides' shortcode in all versions up to and including 1.3.

This vulnerability arises because the plugin does not properly sanitize or escape user-supplied attributes such as userid, albumid, authkey, imgmax, maxresults, random, caption, albumlink, time, and fadespeed in the googleslides_handler() function.

Specifically, these attribute values are directly interpolated into single-quoted HTML attributes without using proper escaping functions like esc_attr(), allowing attackers to inject arbitrary web scripts.

Authenticated attackers with contributor-level access or higher can exploit this to inject malicious scripts that execute whenever a user accesses the infected page.

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Impact Analysis

This vulnerability can allow an attacker with contributor-level access or above to inject malicious scripts into pages on a WordPress site using the vulnerable plugin.

When other users visit these pages, the injected scripts will execute in their browsers, potentially leading to theft of sensitive information, session hijacking, or unauthorized actions performed on behalf of the user.

Because the vulnerability is a Stored Cross-Site Scripting flaw, the malicious code persists on the site and affects all visitors to the compromised pages.

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