CVE-2026-102458: EasyFlow .NET Authentication Bypass Flaw

CVE-2026-102458 Overview

CVE-2026-102458 is a missing authentication vulnerability in Digiwin EasyFlow .NET. The flaw exposes an API endpoint that returns other users' plaintext passwords without requiring authentication. Unauthenticated remote attackers can query this endpoint over the network to harvest credentials. The Taiwan Computer Emergency Response Team (TWCERT) published the advisory tracking this issue under [CWE-306: Missing Authentication for Critical Function].

Critical Impact

Unauthenticated network attackers can retrieve plaintext user passwords through an exposed API, enabling full account takeover and lateral movement across the enterprise workflow environment.

Affected Products

• Digiwin EasyFlow .NET

Discovery Timeline

• 2026-09-30 - CVE-2026-102458 published to the National Vulnerability Database
• 2026-09-30 - Last updated in NVD database

Technical Details for CVE-2026-102458

Vulnerability Analysis

EasyFlow .NET is a workflow automation product developed by Digiwin. The application exposes an API endpoint that returns user credential data. The endpoint does not enforce authentication or authorization checks on incoming requests.

Any attacker with network reachability to the application can invoke the endpoint and receive other users' passwords in plaintext. The response contains credentials in cleartext, indicating the backend stores or transmits passwords without irreversible hashing. This combination of missing authentication and plaintext credential exposure allows complete compromise of every user account managed by the affected deployment.

Root Cause

The root cause is [CWE-306: Missing Authentication for Critical Function]. A sensitive API route that handles credential data was deployed without an authentication guard. Compounding the issue, passwords are retrievable in plaintext rather than as one-way hashes, which violates baseline credential storage guidance.

Attack Vector

The attack vector is network-based and requires no privileges or user interaction. An attacker sends a crafted HTTP request to the vulnerable API endpoint on an exposed EasyFlow .NET instance. The server responds with plaintext passwords belonging to other users. The attacker then reuses those credentials to authenticate to EasyFlow .NET, related enterprise systems, or any external service where users have reused the password. Technical details on the specific endpoint are described in the TWCERT Security Advisory.

Detection Methods for CVE-2026-102458

Indicators of Compromise

• Unauthenticated HTTP requests to EasyFlow .NET API endpoints originating from unexpected internal or external IP addresses.
• API responses containing password fields returned to clients that did not complete an authentication flow.
• Successful logins from new geographies or hosts immediately following anomalous API traffic to the EasyFlow server.
• Password reuse patterns showing EasyFlow credentials being used against Active Directory, VPN, or SaaS applications shortly after suspicious API access.

Detection Strategies

• Deploy web application firewall (WAF) rules that inspect HTTP responses from EasyFlow .NET for password field patterns leaving the application boundary.
• Correlate application access logs with authentication logs to identify credential retrieval calls that lack a preceding login event.
• Baseline normal API traffic volume and alert on spikes in requests to endpoints associated with user or account data.

Monitoring Recommendations

• Forward EasyFlow .NET IIS or application logs to a centralized SIEM for query and retention.
• Monitor egress traffic from the EasyFlow server for unusual outbound connections that may indicate credential exfiltration.
• Track authentication failures and successes across all systems where EasyFlow users maintain accounts to detect credential replay.

How to Mitigate CVE-2026-102458

Immediate Actions Required

• Restrict network access to the EasyFlow .NET application to trusted internal networks and VPN clients only.
• Contact Digiwin support for the patched build addressing CVE-2026-102458 and schedule an emergency change window.
• Force a password reset for every EasyFlow .NET user account and any downstream account that shares those credentials.
• Review historical access logs for evidence of unauthenticated API calls to credential-handling endpoints.

Patch Information

Digiwin has coordinated disclosure through TWCERT. Refer to the TWCERT Security Advisory and the TWCERT Incident Response Report for the current fixed version and vendor guidance. Apply the vendor-supplied update to all EasyFlow .NET instances.

Workarounds

• Block external access to the affected API endpoint at the reverse proxy or WAF until the vendor patch is deployed.
• Place the EasyFlow .NET server behind an authenticating gateway that enforces session validation before requests reach the application.
• Segment the EasyFlow server into a restricted VLAN and permit only required client subnets to reach it.
• Rotate all shared service credentials that may have been exposed and disable inactive user accounts.

# Example: restrict EasyFlow .NET API access with an nginx reverse proxy
location /api/ {
    allow 10.0.0.0/8;
    deny  all;
    proxy_pass http://easyflow-backend;
}