CVE-2025-22689: Forex Calculators XSS Vulnerability

CVE-2025-22689 Overview

CVE-2025-22689 is a stored Cross-Site Scripting (XSS) vulnerability in the Levan Tarbor Forex Calculators (fx-calculators) WordPress plugin. The flaw affects all versions of the plugin up to and including 1.3.6. An authenticated attacker with low privileges can inject persistent JavaScript payloads that execute in the browsers of users who view the affected pages. The issue is classified under CWE-79, Improper Neutralization of Input During Web Page Generation.

Critical Impact
Successful exploitation allows attackers to execute arbitrary script in victim browsers, potentially hijacking sessions, defacing content, or redirecting users to malicious sites within the WordPress site's trust context.

Affected Products

Levan Tarbor Forex Calculators (fx-calculators) WordPress plugin
All versions from initial release through 1.3.6
WordPress sites with the plugin installed and active

Discovery Timeline

2025-02-16 - CVE-2025-22689 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-22689

Vulnerability Analysis

The vulnerability is a stored XSS flaw in the Forex Calculators plugin for WordPress. Stored XSS occurs when user-supplied input is persisted server-side and later rendered into pages without proper output encoding. The plugin fails to neutralize input during web page generation, allowing script content to be saved and later served to other users.

Exploitation requires low privileges on the target WordPress instance and user interaction to trigger the payload. Because the scope changes on successful exploitation, injected scripts can affect components beyond the vulnerable plugin, including other pages within the same origin.

Root Cause

The root cause is missing or insufficient input sanitization and output escaping in the plugin's handling of user-controllable fields. Data submitted through plugin functionality is written to the database and rendered back into HTML contexts without applying WordPress escaping helpers such as esc_html(), esc_attr(), or wp_kses_post(). This omission allows attacker-controlled HTML and JavaScript to persist and execute.

Attack Vector

An authenticated attacker submits a crafted payload containing HTML or JavaScript through an input field exposed by the fx-calculators plugin. The payload is stored in the WordPress database. When an administrator or other user subsequently views the page rendering that stored data, the script executes in their browser session. Refer to the Patchstack XSS Vulnerability Report for further technical context.

Detection Methods for CVE-2025-22689

Indicators of Compromise

Unexpected <script>, <iframe>, or event-handler attributes (for example, onerror, onload) stored in WordPress wp_options or wp_postmeta rows associated with the plugin
Outbound requests from administrator browsers to unfamiliar domains shortly after visiting plugin-managed pages
New or modified WordPress administrator accounts created without a corresponding audit trail
Injected redirects or overlays appearing on pages that render calculator output

Detection Strategies

Scan the WordPress database for HTML tags and JavaScript event handlers within fields populated by the fx-calculators plugin
Enable a Content Security Policy (CSP) in report-only mode to surface unexpected inline script execution
Review WordPress access and audit logs for low-privilege accounts submitting plugin data followed by administrator page views

Monitoring Recommendations

Alert on modifications to plugin-managed database rows containing angle brackets, javascript: URIs, or common XSS keywords
Monitor administrative sessions for anomalous cookie access, credential submission, or DOM mutation activity
Track plugin version inventory across managed WordPress sites to identify hosts still running 1.3.6 or earlier

How to Mitigate CVE-2025-22689

Immediate Actions Required

Identify all WordPress installations running Forex Calculators fx-calculators version 1.3.6 or earlier
Restrict access to plugin functionality to trusted authenticated users until a patch is applied
Audit stored plugin data for previously injected payloads and remove malicious entries
Rotate credentials and session tokens for any administrator who accessed affected pages during the exposure window

Patch Information

At the time of publication, no fixed version above 1.3.6 is referenced in the NVD entry. Consult the Patchstack XSS Vulnerability Report for current patch status and apply the latest available plugin update from the vendor when released.

Workarounds

Deactivate and remove the fx-calculators plugin until a fixed release is available
Deploy a Web Application Firewall (WAF) rule to block XSS payloads targeting plugin endpoints
Enforce a strict Content Security Policy that disallows inline scripts on pages rendering plugin output
Limit contributor and low-privilege roles from accessing plugin submission functionality

bash

# Disable the vulnerable plugin via WP-CLI until a patched release is available
wp plugin deactivate fx-calculators
wp plugin delete fx-calculators

# Audit postmeta for suspicious payloads referencing the plugin
wp db query "SELECT post_id, meta_key, meta_value FROM wp_postmeta \
  WHERE meta_value LIKE '%<script%' OR meta_value LIKE '%onerror=%';"