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The CVE-2025-66307 vulnerability targets the “Forgot Password” functionality within the Grav admin plugin’s interface at the /admin/forgot endpoint. When a password reset request is submitted, the application processes the entered username. Prior to the fixed version, the server provides distinct responses based on the validity of the username. For a valid username, the response may confirm the request and potentially disclose the associated email address directly or through subtle cues. For an invalid username, the response might be a generic error or a different message. This difference in behavior allows an attacker to systematically test for username existence. By sending numerous requests with potential usernames and analyzing the server’s replies—such as HTTP status codes, response times, or content variations—an attacker can enumerate which accounts are registered. Furthermore, in cases where the email address is leaked in the response, sensitive personal information is exposed. This information leakage enables targeted attacks like password spraying, where common passwords are attempted against known valid usernames, or phishing campaigns using the harvested email addresses. The vulnerability stems from inadequate response standardization in the password recovery flow, failing to mask the existence of users. The fix in version 1.11.0-beta.1 uniformizes all responses, eliminating the discernible differences that lead to enumeration and disclosure.
Platform: Grav Admin Plugin
Version: Before 1.11.0-beta.1
Vulnerability: User email disclosure
Severity: Medium
Date: 2025-12-01
Prediction: Fixed 1.11.0-beta.1
What Undercode Say:
Analytics:
curl -s -o response_valid.txt -w "%{http_code}" -X POST https://victim.com/admin/forgot -d "username=known_user"
curl -s -o response_invalid.txt -w "%{http_code}" -X POST https://victim.com/admin/forgot -d "username=unknown_user"
diff response_valid.txt response_invalid.txt
import requests
for user in potential_users:
r = requests.post('https://victim.com/admin/forgot', data={'username': user})
if 'email sent' in r.text:
print(f'Valid user: {user}')
How Exploit:
Attackers send POST requests to /admin/forgot with username lists, analyzing response differences to identify valid accounts and extract emails.
Protection from this CVE:
Upgrade to version 1.11.0-beta.1 or later; implement generic responses for all forgot password attempts.
Impact:
User enumeration, email exposure, facilitating targeted attacks like phishing and password spraying.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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