Description

Observable response discrepancy vulnerability in Menulux Software Inc. Menulux Portal allows Account Footprinting. This issue affects Menulux Portal: before 20260903211448.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.5",
  "pubDate": "2026-09-04T12:17:18.443Z",
  "pubdate": "2026-09-04T12:17:18.443Z",
  "executiveSummary": "Menulux Portal is susceptible to an observable response discrepancy vulnerability, facilitating account footprinting.\nThis vulnerability allows unauthorized actors to determine the existence of valid user accounts within the system based on variations in server responses.\nAffected product: Menulux Portal, versions prior to 20260903211448.\nThe risk implication is primarily focused on reconnaissance; by successfully identifying valid usernames or account identifiers, an attacker can curate targeted lists for subsequent malicious activities such as brute-force attacks, credential stuffing, or targeted social engineering.\nThe vulnerability does not require authentication to exploit, as the discrepancy occurs during the login or account verification process.\nExploitation is straightforward and can be automated to rapidly scan against the target application's directory of potential account identifiers.",
  "technicalDetails": "The vulnerability is identified as an observable response discrepancy, a type of information leakage where the application returns distinct, discernible signals based on the validity of provided input.\nRoot Cause: The authentication or user lookup mechanism within the Menulux Portal fails to implement uniform response handling for varying input scenarios. Specifically, the system produces inconsistent application behavior, such as differing HTTP status codes, specific error message strings, varying response latency, or disparate content-length headers when comparing valid versus invalid account identifiers.\nAttack Flow: An attacker initiates requests against the Menulux Portal authentication endpoints with a list of known or guessed identifiers. By analyzing the differential responses (e.g., 'User not found' versus 'Invalid password' or timing differences in the processing of the request), the attacker maps which identifiers correspond to active, registered accounts.\nVulnerable Component: The backend authentication logic responsible for validating user existence prior to or during the authentication handshake.\nAffected Versions: All Menulux Portal versions prior to 20260903211448.\nAuthentication/Privilege Requirements: No authentication is required to interact with the vulnerable endpoint, allowing unauthenticated attackers to perform wide-scale enumeration.\nNetwork Exposure: The vulnerability is exploitable via standard web requests over HTTP/HTTPS, making it globally accessible if the portal is exposed to the public internet.\nPayload Behavior: The payload involves sending iterative probes containing potential usernames, email addresses, or account IDs. The behavior is passive from the perspective of the application but highly effective for the attacker to infer internal data states.\nPost-Exploitation Impact: Successful footprinting allows an attacker to build an accurate database of valid users. This significantly elevates the success probability of downstream attacks, such as password spraying or credential stuffing, as the attacker no longer needs to waste resources on non-existent accounts."
}