CVE-2025-55126
📋 TL;DR
This stored XSS vulnerability allows attackers to inject malicious scripts into advertiser campaign names, which then execute when users view affected pages. The vulnerability affects users accessing advertiser-related pages on the platform. Attackers can steal session cookies, redirect users, or perform actions on their behalf.
💻 Affected Systems
- HackerOne platform
📦 What is this software?
Revive Adserver by Aquaplatform
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator session cookies, gain full administrative access, compromise user accounts, and potentially pivot to internal systems.
Likely Case
Attackers steal user session cookies to hijack accounts, redirect users to phishing sites, or perform unauthorized actions within user contexts.
If Mitigated
With proper input validation and output encoding, malicious scripts are neutralized before execution, preventing any client-side impact.
🎯 Exploit Status
Exploitation requires ability to create or modify campaign names. Stored XSS payloads execute automatically when users view affected pages.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown - fixed by HackerOne after report
Vendor Advisory: https://hackerone.com/reports/3411750
Restart Required: No
Instructions:
1. Apply HackerOne's security patch for the platform. 2. Ensure proper input validation and output encoding for campaign names. 3. Test that XSS payloads are properly sanitized.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side validation to reject or sanitize HTML/JavaScript in campaign names
Content Security Policy
allImplement strict CSP headers to prevent script execution from untrusted sources
🧯 If You Can't Patch
- Implement WAF rules to block XSS payloads in campaign name parameters
- Monitor for suspicious campaign name patterns and alert on potential XSS attempts
🔍 How to Verify
Check if Vulnerable:
Test by attempting to inject XSS payloads into campaign name fields and checking if they execute when viewing advertiser pagesCheck Version:
Check HackerOne platform version or contact HackerOne support for patch verificationVerify Fix Applied:
Attempt to inject common XSS payloads into campaign names and verify they are properly sanitized and do not execute📡 Detection & Monitoring
Log Indicators:
- Unusual campaign name patterns containing script tags or JavaScript
- Multiple failed attempts to create campaigns with special characters
Network Indicators:
- Outbound connections to suspicious domains from advertiser pages
- Unexpected POST requests with encoded payloads
SIEM Query:
search campaign_name=*script* OR campaign_name=*javascript* OR campaign_name=*onerror*