CVE-2024-25837
📋 TL;DR
This stored XSS vulnerability in October CMS Bloghub Plugin allows attackers to inject malicious scripts into blog comments, which then execute in visitors' browsers. Attackers can steal session cookies, redirect users, or perform actions on their behalf. All October CMS installations using Bloghub Plugin v1.3.8 or lower are affected.
💻 Affected Systems
- October CMS Bloghub Plugin
📦 What is this software?
October by Octobercms
⚠️ Risk & Real-World Impact
Worst Case
Attackers steal administrator session cookies, gain full control of the CMS, deface websites, or install backdoors for persistent access.
Likely Case
Attackers steal user session cookies, redirect visitors to malicious sites, or perform limited actions within the compromised user's context.
If Mitigated
With proper input validation and output encoding, malicious scripts are rendered harmless as plain text.
🎯 Exploit Status
Exploitation requires only submitting a crafted comment payload; no authentication needed if comments are open to public.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v1.3.9
Vendor Advisory: https://github.com/RatMD/bloghub-plugin/blob/master/CHANGELOG.md#version-139---stable
Restart Required: No
Instructions:
1. Access October CMS backend. 2. Navigate to Updates section. 3. Update Bloghub Plugin to v1.3.9. 4. Clear cache if needed.
🔧 Temporary Workarounds
Disable Comments Feature
allTemporarily disable blog comments to prevent exploitation.
Navigate to Bloghub Plugin settings and disable comments
Implement Content Security Policy
allAdd CSP headers to restrict script execution from untrusted sources.
Add 'Content-Security-Policy: script-src 'self'' to web server configuration
🧯 If You Can't Patch
- Implement WAF rules to block XSS payloads in comment submissions
- Enable comment moderation and manually review all submissions before publishing
🔍 How to Verify
Check if Vulnerable:
Check Bloghub Plugin version in October CMS backend; if ≤1.3.8, vulnerable.Check Version:
Check via October CMS backend or inspect plugin.json fileVerify Fix Applied:
Verify Bloghub Plugin version is ≥1.3.9 and test comment submission with XSS payloads.📡 Detection & Monitoring
Log Indicators:
- Unusual comment submissions with script tags or JavaScript code
- Multiple failed comment submissions with encoded payloads
Network Indicators:
- HTTP requests containing script tags in comment parameters
- Unusual outbound connections from comment pages
SIEM Query:
source="web_logs" AND (uri_path="/blog/comment" OR uri_path="/comment") AND (message LIKE "%<script>%" OR message LIKE "%javascript:%")