CVE-2025-49875: If-So Dynamic Content Plugin XSS Vulnerability

CVE-2025-49875 Overview

CVE-2025-49875 is a stored Cross-Site Scripting (XSS) vulnerability in the If-So Dynamic Content Personalization plugin for WordPress. The flaw affects all versions up to and including 1.9.3.1. The plugin fails to properly neutralize user-supplied input during web page generation, allowing authenticated attackers with low privileges to inject persistent JavaScript payloads. Because the scope changes when the payload executes, stored scripts can affect other users, including administrators viewing plugin-generated content. The vulnerability is categorized under CWE-79.

Critical Impact
Authenticated attackers can store malicious JavaScript that executes in the browsers of other site users, enabling session theft, credential harvesting, and administrative account takeover.

Affected Products

If-So Dynamic Content Personalization plugin for WordPress
All plugin versions from initial release through 1.9.3.1
WordPress sites with the if-so plugin installed and active

Discovery Timeline

2025-06-17 - CVE-2025-49875 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-49875

Vulnerability Analysis

The vulnerability is a stored Cross-Site Scripting flaw in the If-So Dynamic Content Personalization plugin. The plugin accepts user-controlled input intended for personalization triggers and dynamic content blocks, but does not adequately sanitize or encode that input before rendering it back into the DOM. As a result, an attacker with contributor-level access or higher can persist arbitrary HTML and JavaScript through plugin-provided fields.

When a victim, typically an administrator or editor, later views a page or admin screen containing the injected content, the malicious script executes in the victim's browser session. User interaction is required to trigger execution, which aligns with the network attack vector and low-privilege requirement described in the CVSS metrics. The scope-change component reflects that the injected script can act beyond the attacker's original security context. The EPSS score sits at 0.174%, indicating low observed exploitation activity to date.

Root Cause

The root cause is improper neutralization of input during web page generation. The plugin renders attacker-supplied values into HTML output without applying context-appropriate escaping such as esc_html(), esc_attr(), or wp_kses_post(). This allows raw <script> tags or event-handler attributes to survive into the rendered page.

Attack Vector

An authenticated user submits crafted content through an If-So plugin field, such as a personalization trigger label, condition value, or dynamic content block. The payload is stored in the WordPress database. When another user loads a page or admin view that renders the stored value, the browser parses and executes the injected script. Typical payloads target administrator sessions to steal authentication cookies, create rogue administrator accounts, or install malicious plugin code. No proof-of-concept code has been published in the referenced advisories; see the Patchstack advisory for additional detail.

Detection Methods for CVE-2025-49875

Indicators of Compromise

Unexpected <script> tags, onerror, or onload attributes stored in WordPress wp_posts or wp_postmeta records associated with If-So plugin content
New WordPress administrator accounts created shortly after an authenticated user edits If-So plugin content
Outbound browser requests from admin sessions to unfamiliar domains referenced in If-So personalization fields
Modifications to theme or plugin files immediately after an administrator loads a page containing If-So dynamic content

Detection Strategies

Query the WordPress database for If-So plugin post types and metadata containing HTML tags or JavaScript keywords such as script, onerror, javascript:, or document.cookie
Review web server logs for POST requests to If-So plugin endpoints originating from contributor or author accounts
Compare current If-So plugin content against known-good backups to identify unauthorized modifications

Monitoring Recommendations

Enable WordPress audit logging for plugin option changes and post updates involving the if-so post types
Alert on creation of new administrator accounts or role escalations following recent plugin content edits
Monitor Content Security Policy (CSP) violation reports for inline script execution on pages using dynamic personalization

How to Mitigate CVE-2025-49875

Immediate Actions Required

Update the If-So Dynamic Content Personalization plugin to a version later than 1.9.3.1 as soon as a patched release is available
Audit all existing If-So plugin content for embedded HTML or JavaScript and remove suspicious entries
Rotate WordPress administrator passwords and invalidate active sessions if unauthorized edits are found
Restrict contributor and author roles to trusted users only until the plugin is patched

Patch Information

Refer to the Patchstack XSS Vulnerability Advisory for the latest patched version and vendor guidance. Apply the fix through the WordPress plugin update mechanism once available.

Workarounds

Temporarily deactivate the If-So Dynamic Content Personalization plugin until a patched version is installed
Deploy a Web Application Firewall (WAF) rule to block requests containing <script> tags or JavaScript event handlers targeting If-So plugin endpoints
Enforce a strict Content Security Policy that disallows inline script execution on WordPress pages
Revoke publishing and editing capabilities for non-essential accounts to reduce the attacker pool

bash

# Example Content Security Policy header to mitigate inline script execution
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; report-uri /csp-report"