CVE-2025-12178: SpiceForms Form Builder XSS Vulnerability

CVE-2025-12178 Overview

The SpiceForms Form Builder plugin for WordPress contains a Stored Cross-Site Scripting (XSS) vulnerability in the spiceforms shortcode functionality. This vulnerability affects all versions up to and including 1.0 and stems from insufficient input sanitization and output escaping on user-supplied attributes. Authenticated attackers with contributor-level access or higher can inject arbitrary web scripts into pages that execute whenever any user visits the compromised page.

Critical Impact

Authenticated attackers can persistently inject malicious JavaScript code that executes in the browsers of all users viewing affected pages, potentially leading to session hijacking, credential theft, defacement, or further attacks against site visitors.

Affected Products

• SpiceForms Form Builder WordPress Plugin version 1.0 and earlier
• WordPress sites utilizing the spiceforms shortcode functionality
• Any WordPress installation where contributors can create or edit content with shortcodes

Discovery Timeline

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

Technical Details for CVE-2025-12178

Vulnerability Analysis

This Stored Cross-Site Scripting vulnerability exists within the SpiceForms Form Builder plugin's shortcode handler. The plugin fails to properly sanitize and escape user-supplied attributes when processing the spiceforms shortcode, allowing attackers to embed malicious JavaScript code that persists in the database and executes in victims' browsers.

The vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), which occurs when an application includes user-controlled data in dynamic web content without proper validation or encoding. In this case, shortcode attributes provided by authenticated users with at least contributor privileges are rendered without adequate output escaping.

Unlike reflected XSS attacks that require victims to click malicious links, this stored variant persists on the server, affecting all visitors to the compromised page. The scope of impact extends beyond the vulnerable component, as injected scripts can access cookies, session tokens, and other sensitive information within the browser context.

Root Cause

The root cause of this vulnerability lies in the shortcode processing logic within the spiceform.php file. When the spiceforms shortcode is parsed, user-supplied attributes are incorporated into the rendered HTML output without proper sanitization or escaping. WordPress provides functions like esc_attr(), esc_html(), and wp_kses() for sanitizing output, but these are either missing or insufficiently applied in the vulnerable code path.

The vulnerable code can be reviewed in the WordPress SpiceForms Code Review at line 135 of the shortcode handler.

Attack Vector

The attack is network-based and requires authenticated access to WordPress with at least contributor-level permissions. The attacker crafts a malicious spiceforms shortcode containing JavaScript payloads within attribute values. When a page or post containing this shortcode is published or previewed, the malicious script is stored in the database.

Subsequently, any user—including administrators—who views the affected page will have the malicious JavaScript execute in their browser context. This can lead to session cookie theft, keylogging, phishing overlay injection, cryptocurrency mining, or redirection to malicious sites.

The vulnerability mechanism involves injecting script content through improperly escaped shortcode attributes. Attackers leverage standard XSS payload techniques such as event handlers or script tags embedded within attribute values. For detailed technical analysis, refer to the Wordfence Vulnerability Report.

Detection Methods for CVE-2025-12178

Indicators of Compromise

• Presence of suspicious JavaScript code within posts or pages containing [spiceforms] shortcodes
• Unexpected event handlers (e.g., onload, onerror, onmouseover) in shortcode attribute values
• User reports of browser alerts, redirects, or unusual behavior when viewing specific pages
• Evidence of unauthorized session activity from administrators or editors following page views

Detection Strategies

• Review WordPress database for posts containing spiceforms shortcodes with suspicious attribute patterns
• Implement Web Application Firewall (WAF) rules to detect and block XSS payloads in shortcode content
• Monitor server logs for POST requests creating or modifying content with encoded JavaScript patterns
• Deploy Content Security Policy (CSP) headers to detect and report inline script execution attempts

Monitoring Recommendations

• Enable WordPress audit logging to track shortcode usage and content modifications by contributors
• Configure SentinelOne Singularity to monitor for anomalous browser behavior and script injection attempts
• Implement real-time alerting for content changes containing potentially malicious patterns
• Regularly scan stored content for XSS indicators using automated security tools

How to Mitigate CVE-2025-12178

Immediate Actions Required

• Audit all existing posts and pages using the spiceforms shortcode for malicious content
• Temporarily disable the SpiceForms Form Builder plugin until a patched version is available
• Review and restrict contributor-level user accounts to trusted individuals only
• Implement Content Security Policy headers to limit inline script execution

Patch Information

As of the last NVD update on 2026-01-14, no official patch has been confirmed for this vulnerability. Site administrators should monitor the Wordfence Vulnerability Report for updates regarding fixes from the plugin developer. Consider replacing SpiceForms Form Builder with an alternative form plugin that has a stronger security track record until a patch is released.

Workarounds

• Disable or uninstall the SpiceForms Form Builder plugin until a security update is available
• Restrict the ability to use shortcodes by limiting contributor and author roles
• Implement a WAF rule to sanitize or block requests containing the spiceforms shortcode with suspicious attributes
• Use WordPress security plugins to scan and sanitize stored content for XSS payloads

# WordPress CLI command to find posts containing spiceforms shortcode
wp db query "SELECT ID, post_title FROM wp_posts WHERE post_content LIKE '%[spiceforms%' AND post_status = 'publish';"

# Disable the plugin via WP-CLI
wp plugin deactivate spiceforms-form-builder