CVE-2025-1286
📋 TL;DR
This vulnerability in the Download HTML TinyMCE Button WordPress plugin allows attackers to inject malicious scripts via unsanitized parameters, which are then reflected back in web pages. It primarily affects WordPress sites using this plugin, potentially compromising high-privilege users like administrators through reflected cross-site scripting attacks.
💻 Affected Systems
- Download HTML TinyMCE Button WordPress plugin
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker could steal administrator session cookies, gain administrative access to the WordPress site, install backdoors, deface the site, or pivot to internal network resources.
Likely Case
Attackers would use this to hijack administrator sessions, potentially gaining control over the WordPress site to modify content, install malicious plugins, or steal sensitive data.
If Mitigated
With proper input validation and output escaping, the attack would fail, preventing script injection and maintaining site integrity.
🎯 Exploit Status
Reflected XSS vulnerabilities are commonly exploited. No authentication is required, but exploitation requires tricking a user (especially an admin) into clicking a malicious link.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.3 or later
Vendor Advisory: https://wpscan.com/vulnerability/c42556c7-09b6-49ae-9f87-cbaf16e7c280/
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'Download HTML TinyMCE Button'. 4. Click 'Update Now' if update is available. 5. Alternatively, download version 1.3+ from WordPress repository and replace the plugin files.
🔧 Temporary Workarounds
Disable the vulnerable plugin
allTemporarily disable the Download HTML TinyMCE Button plugin until patched.
wp plugin deactivate download-html-tinymce-button
Implement WAF rules
allAdd web application firewall rules to block XSS payloads targeting the vulnerable parameter.
🧯 If You Can't Patch
- Remove the Download HTML TinyMCE Button plugin completely from your WordPress installation.
- Implement strict Content Security Policy (CSP) headers to mitigate XSS impact.
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for 'Download HTML TinyMCE Button' version 1.2 or earlier.Check Version:
wp plugin get download-html-tinymce-button --field=versionVerify Fix Applied:
Verify the plugin version is 1.3 or later in WordPress admin panel, or test with safe XSS payloads to confirm sanitization.📡 Detection & Monitoring
Log Indicators:
- Unusual GET/POST requests containing script tags or JavaScript in parameters
- Requests to plugin-specific endpoints with suspicious payloads
Network Indicators:
- HTTP requests with encoded script payloads in query parameters
- Traffic patterns showing XSS exploitation attempts
SIEM Query:
source="web_logs" AND (uri="*download-html-tinymce-button*" AND (param="*<script>*" OR param="*javascript:*"))