CVE-2026-25452: WPDO Remoji Stored XSS Vulnerability

CVE-2026-25452 Overview

CVE-2026-25452 is a Stored Cross-Site Scripting (XSS) vulnerability affecting the WPDO Remoji WordPress plugin. The vulnerability stems from improper neutralization of input during web page generation, allowing attackers to inject malicious scripts that persist in the application and execute in victims' browsers when they view the affected content.

Critical Impact
Attackers can inject persistent malicious scripts that execute in the context of authenticated users' sessions, potentially leading to session hijacking, credential theft, website defacement, or malware distribution to site visitors.

Affected Products

WPDO Remoji plugin version 2.2 and earlier
WordPress installations with the Remoji plugin enabled
All versions from initial release through version 2.2

Discovery Timeline

2026-03-25 - CVE CVE-2026-25452 published to NVD
2026-03-25 - Last updated in NVD database

Technical Details for CVE-2026-25452

Vulnerability Analysis

This Stored XSS vulnerability (CWE-79) in the Remoji WordPress plugin allows attackers to inject malicious JavaScript code that gets stored server-side and subsequently delivered to other users viewing the affected content. Unlike reflected XSS attacks, stored XSS payloads persist in the application's database, making them particularly dangerous as they can affect multiple victims without requiring direct interaction with the attacker.

The vulnerability requires no authentication to exploit but does require user interaction—specifically, a victim must view a page containing the stored malicious payload. The attack can affect resources beyond the vulnerable component's scope, potentially compromising confidentiality, integrity, and availability of the WordPress site and its users' data.

Root Cause

The root cause is improper input sanitization and output encoding in the Remoji plugin. User-supplied input containing JavaScript or HTML is not adequately neutralized before being stored in the database or rendered in web pages. This allows attackers to inject script tags or event handlers that execute in victims' browsers with the privileges of the affected site's origin.

Attack Vector

The attack is network-based and exploits the plugin's failure to properly sanitize emoji-related content or associated user input fields. An attacker can craft a malicious payload containing JavaScript code disguised within seemingly innocuous input. When this content is stored by the plugin and later rendered to other users (including administrators), the malicious script executes within the victim's browser session.

A typical attack scenario involves injecting a payload that exfiltrates session cookies or authentication tokens, allowing the attacker to hijack administrator sessions. The stored nature of this XSS means the payload persists until manually removed, potentially affecting all visitors to the compromised page.

Detection Methods for CVE-2026-25452

Indicators of Compromise

Unexpected JavaScript code or <script> tags appearing in database entries related to the Remoji plugin
Unusual outbound network requests from visitors' browsers to unknown external domains
Reports of unexpected pop-ups, redirects, or behavior from site visitors
Modified content in emoji-related database tables or WordPress options

Detection Strategies

Implement Web Application Firewall (WAF) rules to detect and block common XSS payloads targeting the Remoji plugin
Monitor server logs for suspicious POST requests containing script tags or JavaScript event handlers
Conduct regular database audits for stored XSS payloads in plugin-related tables
Deploy Content Security Policy (CSP) headers and monitor for CSP violation reports

Monitoring Recommendations

Enable and review WordPress audit logging for content modifications
Implement real-time alerting for JavaScript execution patterns indicative of XSS attacks
Monitor for unauthorized session creation or privilege escalation following page views
Review browser-side security logs for CSP violations originating from the affected plugin

How to Mitigate CVE-2026-25452

Immediate Actions Required

Deactivate and remove the Remoji plugin until a patched version is available
Audit the WordPress database for any stored malicious payloads that may have been injected
Review administrator accounts for unauthorized access or suspicious activity
Implement a Web Application Firewall with XSS filtering rules as a compensating control

Patch Information

At the time of this publication, no vendor patch has been released. Website administrators should monitor the Patchstack XSS Vulnerability Report for updates regarding a security fix. Consider replacing the plugin with an alternative that provides similar functionality with proper input sanitization.

Workarounds

Disable the Remoji plugin entirely until a security patch is released
Implement strict Content Security Policy headers to prevent inline script execution
Deploy a WAF with XSS filtering capabilities in front of the WordPress installation
Restrict access to plugin functionality to trusted authenticated users only

bash

# Add Content Security Policy header in .htaccess as a compensating control
<IfModule mod_headers.c>
    Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline';"
</IfModule>

# Alternatively, disable the plugin via WP-CLI
wp plugin deactivate remoji --path=/var/www/html