CVE-2026-19080 Overview
CVE-2026-19080 is an observable response discrepancy vulnerability [CWE-204] in Menulux Software Inc. Menulux Portal. The flaw enables account footprinting through differences in server responses. Attackers can enumerate valid accounts by observing how the portal handles authentication or account-related requests. The issue affects Menulux Portal versions before 20260903211448.
The vulnerability is exploitable over the network without authentication or user interaction. Account enumeration provides attackers with a list of valid usernames or email addresses. This information supports follow-on credential stuffing, password spraying, and targeted phishing campaigns.
Critical Impact
Unauthenticated remote attackers can enumerate valid Menulux Portal accounts by analyzing response differences, enabling downstream credential-based attacks.
Affected Products
- Menulux Software Inc. Menulux Portal (all versions before 20260903211448)
Discovery Timeline
- 2026-09-04 - CVE-2026-19080 published to NVD
- 2026-09-08 - Last updated in NVD database
Technical Details for CVE-2026-19080
Vulnerability Analysis
The vulnerability is classified as an observable response discrepancy [CWE-204]. The Menulux Portal returns distinguishable responses depending on whether a submitted account identifier exists. Attackers compare response bodies, HTTP status codes, headers, or timing characteristics to infer account validity.
This class of flaw commonly appears in login, password reset, or registration flows. When the application discloses whether an account exists, it converts a private data point into a queryable oracle. Attackers automate requests across large username or email lists to build a directory of valid accounts.
The confidentiality impact is direct: account existence data leaks to unauthenticated parties. Integrity and availability are not directly affected. However, the leaked data feeds downstream attacks that can compromise both.
Root Cause
The root cause is inconsistent handling of valid versus invalid account identifiers in server responses. The application likely returns different messages, status codes, or response times for known and unknown accounts. Secure implementations return identical generic responses regardless of account state.
Attack Vector
An unauthenticated attacker sends crafted requests to the Menulux Portal over the network. The attacker submits candidate usernames or email addresses to endpoints that process account identifiers. By comparing responses, the attacker determines which accounts exist. Refer to the Siber Güvenlik Notification TR-26-0989 for advisory details.
No verified public proof-of-concept code is available. The vulnerability mechanism is described in prose based on the CWE-204 classification and vendor advisory.
Detection Methods for CVE-2026-19080
Indicators of Compromise
- High-volume sequential requests to Menulux Portal login, password reset, or registration endpoints from a single source address.
- Requests iterating through structured lists of usernames or email addresses within short timeframes.
- Elevated rates of failed authentication attempts following account enumeration reconnaissance.
Detection Strategies
- Monitor web server access logs for repeated requests to authentication-related endpoints with varying account identifiers.
- Correlate enumeration traffic patterns with subsequent credential stuffing or password spraying attempts.
- Baseline normal request rates to account-handling endpoints and alert on statistical deviations.
Monitoring Recommendations
- Deploy web application firewall rules that rate-limit requests to login and password reset endpoints.
- Log and review HTTP response distributions for account-related endpoints to identify discrepancies attackers could exploit.
- Track authentication failure ratios per source IP and per account to identify enumeration campaigns.
How to Mitigate CVE-2026-19080
Immediate Actions Required
- Upgrade Menulux Portal to version 20260903211448 or later.
- Enforce rate limiting and CAPTCHA challenges on authentication, registration, and password reset endpoints.
- Review web server logs for historical enumeration activity and reset credentials for exposed accounts.
Patch Information
Menulux Software Inc. addresses this vulnerability in Menulux Portal version 20260903211448. Consult the Siber Güvenlik Notification TR-26-0989 for vendor guidance and patch acquisition.
Workarounds
- Configure web application firewall rules to normalize response sizes and timing for account-related endpoints.
- Implement generic response messages that do not disclose account existence for login, password reset, and registration flows.
- Enforce multi-factor authentication to reduce the value of enumerated accounts in downstream credential attacks.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.