CVE-2025-57692
📋 TL;DR
PiranhaCMS 12.0 contains a stored cross-site scripting (XSS) vulnerability in the Text content block editor. Attackers can inject malicious JavaScript that executes in other users' browsers when they view affected pages. This affects all PiranhaCMS 12.0 installations using Standard or Standard Archive pages.
💻 Affected Systems
- PiranhaCMS
📦 What is this software?
Piranha Cms by Dotnetfoundation
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator session cookies, perform actions as authenticated users, deface websites, or redirect users to malicious sites.
Likely Case
Attackers with editor access inject malicious scripts that execute when other users view pages, potentially stealing session data or performing limited unauthorized actions.
If Mitigated
With proper input validation and output encoding, malicious scripts are neutralized before reaching user browsers.
🎯 Exploit Status
Requires authenticated access to the page editor. Exploitation involves injecting JavaScript into Text content blocks.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v12.0.1 or later
Vendor Advisory: https://github.com/PiranhaCMS/piranha.core/releases/tag/v12.0
Restart Required: No
Instructions:
1. Backup your PiranhaCMS installation. 2. Update to v12.0.1 or later via package manager or manual download. 3. Verify the update completed successfully.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side input validation to sanitize HTML/JavaScript in Text content blocks
Content Security Policy
allImplement strict CSP headers to restrict script execution
🧯 If You Can't Patch
- Restrict editor access to trusted users only
- Implement web application firewall rules to block XSS payloads
🔍 How to Verify
Check if Vulnerable:
Check if running PiranhaCMS version 12.0. Review Text content blocks for suspicious JavaScript.Check Version:
Check PiranhaCMS admin panel or package manager for version informationVerify Fix Applied:
Confirm version is 12.0.1 or later. Test Text content block for XSS by attempting to inject basic script tags.📡 Detection & Monitoring
Log Indicators:
- Unusual content edits in Text blocks
- Multiple failed XSS attempts in logs
Network Indicators:
- Unexpected JavaScript execution in page responses
SIEM Query:
Search for patterns like <script> or javascript: in page edit logs