CVE-2026-8076: CashDro 3 Auth Bypass Vulnerability

CVE-2026-8076 Overview

CVE-2026-8076 is a weak authentication vulnerability affecting the CashDro 3 web administration panel, version 24.01.00.26. The platform permits numeric PIN-based authentication to maintain compatibility with point-of-sale (POS) software integrations dating back to 2012. The system does not enforce account lockout after repeated failed login attempts, allowing attackers to brute-force PIN credentials remotely. Successful exploitation grants unauthorized access to confidential configuration settings within the cash management device, compromising the security posture of the affected deployment. The flaw is classified under CWE-1391: Use of Weak Credentials.

Critical Impact

Remote, unauthenticated attackers can brute-force numeric PINs to gain administrative access to CashDro 3 cash management devices, exposing sensitive configuration data.

Affected Products

• CashDro 3 web administration panel, version 24.01.00.26
• POS integrations relying on legacy PIN-based authentication
• Deployments inheriting the 2012-era authentication compatibility model

Discovery Timeline

• 2026-05-07 - Technical details published in the ITRESIT Labs research post
• 2026-05-08 - CVE-2026-8076 published to NVD and covered in the INCIBE security notice
• 2026-05-08 - Last updated in NVD database

Technical Details for CVE-2026-8076

Vulnerability Analysis

The CashDro 3 administration panel authenticates users using short numeric PINs. The PIN search space is small compared to standard passwords, making credential guessing tractable for automated tooling. The application does not implement account lockout, rate limiting, or progressive delays on failed authentication attempts. An unauthenticated attacker with network reach to the panel can submit unlimited authentication requests until valid credentials are discovered.

Once authenticated, the attacker obtains access to confidential configuration settings exposed by the panel. According to the ITRESIT research, this access can be chained with additional CashDro 3 flaws to extract funds from the connected cash management hardware. The vulnerability requires no user interaction and no prior privileges.

Root Cause

The root cause is the platform's decision to accept low-entropy numeric PINs as a primary authentication factor combined with the absence of brute-force protections. The authentication design preserves backward compatibility with POS integrations deployed since 2012, prioritizing interoperability over credential strength. No multi-factor authentication or anomaly-based throttling is enforced on the administrative interface.

Attack Vector

The attack is delivered over the network against the exposed web administration panel. An attacker enumerates valid users and submits sequential or dictionary-based PIN values through the panel's login endpoint. Because failed attempts neither lock the account nor introduce delays, a script can iterate the complete PIN space within minutes. After authentication, the attacker browses configuration endpoints to retrieve sensitive operational data.

No public proof-of-concept code has been released. Technical context is available in the ITRESIT pentest write-up.

Detection Methods for CVE-2026-8076

Indicators of Compromise

• High volume of failed authentication requests targeting the CashDro 3 web administration panel from a single source IP or distributed sources
• Successful logins immediately following extended sequences of failed attempts against the same user identifier
• Access to administrative configuration endpoints from IP addresses not previously associated with operator activity

Detection Strategies

• Aggregate web server and application logs for the panel and alert on more than 20 failed authentication attempts per user within a short window
• Baseline normal administrator login sources and flag authentication events originating from new geolocations or networks
• Correlate authentication failure spikes with subsequent configuration read events to identify successful brute-force outcomes

Monitoring Recommendations

• Forward CashDro 3 panel access and authentication logs to a centralized SIEM for retention and correlation
• Monitor network traffic to the administrative interface and alert on traffic from non-management network segments
• Track configuration export and settings-read operations and require alerting when these occur outside scheduled maintenance windows

How to Mitigate CVE-2026-8076

Immediate Actions Required

• Restrict network access to the CashDro 3 web administration panel to trusted management VLANs or a jump-host network only
• Rotate all administrative PINs and assign the maximum supported PIN length to every account
• Audit recent authentication logs for brute-force patterns and successful logins that followed bursts of failures

Patch Information

No vendor patch identifier is referenced in the current NVD entry. Operators should consult the INCIBE security notice and contact the vendor directly to obtain the latest firmware and remediation guidance for CashDro 3 deployments.

Workarounds

• Place the administration panel behind a VPN or reverse proxy that enforces strong authentication and rate limiting in front of the application
• Disable or remove unused administrative accounts and enforce unique PINs across operators
• Implement upstream Web Application Firewall (WAF) rules to throttle repeated POST requests to the login endpoint

# Example: rate-limit the panel login endpoint with nginx in front of CashDro 3
limit_req_zone $binary_remote_addr zone=cashdro_login:10m rate=5r/m;

server {
    listen 443 ssl;
    server_name cashdro.internal.example;

    location /login {
        limit_req zone=cashdro_login burst=5 nodelay;
        limit_req_status 429;
        proxy_pass http://cashdro-backend;
    }

    # Restrict access to the management network only
    allow 10.10.20.0/24;
    deny  all;
}