CVE-2025-12178: SpiceForms Form Builder XSS Vulnerability

CVE-2025-12178 Overview

CVE-2025-12178 is a Stored Cross-Site Scripting (XSS) vulnerability affecting the SpiceForms Form Builder plugin for WordPress. The flaw exists in all versions up to and including 1.0 and stems from insufficient input sanitization and output escaping on user-supplied attributes processed by the spiceforms shortcode. Authenticated attackers with contributor-level access or higher can inject arbitrary JavaScript into pages. The injected scripts execute in the browser context of any user who views the affected page. The vulnerability is classified under CWE-79.

Critical Impact
Contributor-level users can persist malicious JavaScript that executes for any visitor, enabling session theft, administrative action hijacking, and site defacement.

Affected Products

SpiceForms Form Builder plugin for WordPress
All versions up to and including 1.0
WordPress sites permitting contributor-level or higher user registration

Discovery Timeline

2026-01-14 - CVE-2025-12178 published to NVD
2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-12178

Vulnerability Analysis

The vulnerability resides in the SpiceForms Form Builder plugin's handling of the spiceforms shortcode. WordPress shortcodes accept user-supplied attributes that are processed server-side and rendered into page output. In SpiceForms 1.0, attribute values passed to the spiceforms shortcode are reflected into the rendered HTML without proper sanitization or output escaping.

An authenticated user with contributor privileges can embed the shortcode within post content and supply attribute payloads containing JavaScript. When an editor, administrator, or site visitor later loads the post, the injected script executes in their browser context. Stored XSS in WordPress contexts often leads to administrator session theft, forced account creation, plugin installation, or pivoting to full site takeover.

Root Cause

The root cause is missing input validation and absent output escaping in the shortcode handler referenced at spiceform.php#L135. The handler accepts attribute values from $atts and emits them into HTML without applying WordPress sanitization functions such as esc_attr(), esc_html(), or sanitize_text_field(). The vulnerability falls under CWE-79: Improper Neutralization of Input During Web Page Generation.

Attack Vector

Exploitation requires an authenticated session with at least contributor-level privileges. The attacker creates or edits a post and inserts the spiceforms shortcode with malicious attribute values containing script payloads. The post is saved and, once viewed by an authenticated higher-privileged user or any visitor, the script executes. Because contributor accounts are commonly granted on multi-author WordPress sites, the privilege barrier is low. Technical details are referenced in the WordPress SpiceForms Code Review and the Wordfence Vulnerability Report.

Detection Methods for CVE-2025-12178

Indicators of Compromise

Posts or pages containing spiceforms shortcodes with attribute values that include <script>, onerror=, onload=, or javascript: strings.
Unexpected outbound requests from administrator browsers to attacker-controlled domains after viewing posts containing the shortcode.
New administrator accounts or plugin installations following access by privileged users to contributor-authored content.

Detection Strategies

Query the WordPress wp_posts table for post_content entries matching %[spiceforms% combined with patterns such as script, onerror, or javascript:.
Review WordPress audit logs for contributor accounts publishing or editing posts that embed the spiceforms shortcode.
Inspect rendered HTML output for unescaped attribute values originating from the shortcode handler.

Monitoring Recommendations

Alert on creation or modification of posts by contributor-role users that include shortcode attributes containing HTML control characters.
Monitor administrator session activity for anomalous API calls such as users.php?action=add or unsolicited plugin installations.
Track Content Security Policy (CSP) violation reports from the WordPress front end for inline script execution.

How to Mitigate CVE-2025-12178

Immediate Actions Required

Deactivate the SpiceForms Form Builder plugin until a patched release is published by the vendor.
Audit all contributor and author accounts and remove untrusted or inactive users.
Review existing posts and pages for spiceforms shortcode usage and remove any suspicious attribute payloads.

Patch Information

At the time of publication, no fixed version has been identified in the NVD record. All versions up to and including 1.0 are vulnerable. Site operators should monitor the WordPress plugin repository and the Wordfence advisory for an updated release.

Workarounds

Restrict the contributor role from using shortcodes by filtering the_content or removing spiceforms via remove_shortcode('spiceforms') until patched.
Deploy a Web Application Firewall (WAF) rule that blocks shortcode attribute payloads containing HTML or JavaScript tokens.
Apply a Content Security Policy that disallows inline scripts to reduce the impact of injected payloads.

bash

# Configuration example: disable the vulnerable shortcode in wp-config or a mu-plugin
add_action('init', function () {
    if (shortcode_exists('spiceforms')) {
        remove_shortcode('spiceforms');
    }
}, 100);