CVE-2025-8776: Epic Bootstrap Buttons WordPress XSS Flaw

CVE-2025-8776 Overview

CVE-2025-8776 is a stored Cross-Site Scripting (XSS) vulnerability in the Epic Bootstrap Buttons plugin for WordPress. The flaw affects all plugin versions up to and including 1.0. It originates in the handling of the icol parameter, where the plugin fails to sanitize input and escape output. Authenticated users with Contributor-level access or higher can inject arbitrary JavaScript into pages. The injected scripts execute in the browser of any visitor viewing the affected page, enabling session theft, redirection, or content manipulation. The issue is tracked under CWE-79.

Critical Impact
Authenticated contributors can store malicious JavaScript that executes against every visitor loading the compromised page, including administrators.

Affected Products

Epic Bootstrap Buttons plugin for WordPress — all versions through 1.0
WordPress sites using the plugin with Contributor-level accounts or higher
Any multi-author WordPress environment that permits untrusted contributors

Discovery Timeline

2025-10-03 - CVE-2025-8776 published to the National Vulnerability Database
2026-10-12 - Last updated in NVD database

Technical Details for CVE-2025-8776

Vulnerability Analysis

The Epic Bootstrap Buttons plugin exposes a shortcode-driven interface that accepts an icol parameter to control button styling. The plugin writes this parameter value into generated HTML without encoding dangerous characters. An authenticated attacker crafts a post or page containing a shortcode where icol carries JavaScript payload fragments. When WordPress renders the page, the payload becomes part of the DOM and executes in each visitor's browser context.

Stored XSS in WordPress is particularly impactful because administrators routinely load content authored by lower-privileged users. Script execution in an administrator session can create new admin accounts, modify plugin options, or install additional backdoors. Because the attack vector is network-based and requires only low privileges with no user interaction beyond normal page loads, exploitation is straightforward once contributor access is obtained.

Root Cause

The root cause is insufficient input sanitization and output escaping in the plugin's shortcode handler. WordPress provides sanitize_text_field() for input and esc_attr() or esc_html() for output, but the plugin's epicboot.php logic does not apply these functions to the icol parameter before concatenating it into the rendered markup.

Attack Vector

An attacker with Contributor privileges authors a draft containing the plugin shortcode with a malicious icol value. After the content is published or previewed by a higher-privileged user, the injected script runs. The payload can exfiltrate authentication cookies, submit administrative forms via fetch(), or pivot to other WordPress endpoints under the victim's session.

No verified public exploit code is available for this issue. Technical specifics are documented in the Wordfence Vulnerability Advisory and the WordPress Plugin Source Code.

Detection Methods for CVE-2025-8776

Indicators of Compromise

Post or page content containing Epic Bootstrap Buttons shortcodes with icol values that include <script>, onerror=, onload=, or javascript: substrings
Unexpected outbound requests from administrator browser sessions to attacker-controlled domains following content preview
New WordPress administrator accounts, modified wp_options, or unexpected plugin installations shortly after a contributor publishes content

Detection Strategies

Query the wp_posts table for post_content containing the plugin shortcode and inspect the icol attribute values for HTML or script fragments
Enable a Content Security Policy in report-only mode and review violation reports for inline script execution on pages that render the plugin output
Monitor web server access logs for suspicious POST requests to /wp-admin/post.php from contributor-level accounts that include shortcode payloads

Monitoring Recommendations

Alert on WordPress audit log entries where contributor-level users submit content containing HTML tags inside shortcode attributes
Correlate contributor publishing activity with subsequent administrator session anomalies such as new user creation or role changes
Track plugin version inventory across WordPress deployments to confirm all instances have been updated or removed

How to Mitigate CVE-2025-8776

Immediate Actions Required

Deactivate and remove the Epic Bootstrap Buttons plugin until a patched release is confirmed by the vendor
Audit all existing posts and pages for the plugin's shortcode and strip any icol values containing HTML or script syntax
Review Contributor and Author accounts, disable unused accounts, and rotate credentials for any suspected compromise

Patch Information

At the time of publication, no fixed version is listed in the Wordfence Vulnerability Advisory. Site operators should monitor the WordPress Plugin Developer Info page for an updated release and apply it immediately once available.

Workarounds

Restrict Contributor-level account provisioning to vetted users and require review before content is published
Deploy a web application firewall rule that blocks requests containing script-like payloads inside icol shortcode attributes
Enforce a strict Content Security Policy that disallows inline scripts and unsafe event handlers on the WordPress front end

bash

# Remove the vulnerable plugin via WP-CLI
wp plugin deactivate epic-bootstrap-buttons
wp plugin delete epic-bootstrap-buttons

# Identify posts containing the shortcode for manual review
wp db query "SELECT ID, post_title FROM wp_posts WHERE post_content LIKE '%[epicboot%'"