CVE-2026-21812 in AppScan Integration with Azure Boards for ASoC & A360
Summary
by MITRE • 10/22/2026
HCL AppScan Azure Boards Plugin is affected by a Cleartext Transmission of Sensitive Information vulnerability when configured to communicate with the AppScan server over HTTP. This could allow an attacker to intercept credentials or authentication tokens during transmission. The plugin has been updated to display a warning when HTTP is used and recommend HTTPS for secure communication.
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Analysis
by VulDB Data Team • 10/22/2026
The HCL AppScan Azure Boards Plugin contains a vulnerability classified as Cleartext Transmission of Sensitive Information, which aligns with CWE-319 in the Common Weakness Enumeration framework. This security flaw manifests specifically when the plugin is configured to communicate with the AppScan server using the Hypertext Transfer Protocol rather than its secure counterpart, HTTPS. In such configurations, all data exchanged between the client and the server, including authentication credentials, session tokens, and potentially sensitive project or user information associated with Azure Boards integration, is transmitted in plaintext. This lack of encryption leaves the communication channel vulnerable to interception by malicious actors operating within the same network segment or capable of performing man-in-the-middle attacks on the network path between the plugin interface and the AppScan server infrastructure.
From an operational perspective, this vulnerability poses a significant risk to organizational security posture because it undermines the confidentiality and integrity of authentication mechanisms. An attacker with access to unencrypted network traffic can capture login credentials such as usernames and passwords or steal active session tokens that grant unauthorized access to the HCL AppScan platform. The compromise of these assets allows for potential account takeover, leading to further exploitation where an adversary could manipulate scan configurations, exfiltrate sensitive application source code analyzed by AppScan, or disable security monitoring capabilities. This aligns with ATT&CK technique T1078, Valid Accounts, as the stolen credentials can be used directly to authenticate into the system and perform actions under a legitimate user identity without triggering immediate anomaly detection based on invalid login attempts.
The vulnerability stems from the plugin's configuration handling which permits or defaults to unencrypted HTTP connections in certain deployment scenarios. While modern security best practices dictate that all administrative interfaces and API communications must be encrypted, legacy configurations or misconfigurations may still rely on HTTP for internal network communication under the false assumption of perimeter security. The absence of Transport Layer Security means there is no mechanism to verify the identity of the server nor encrypt the payload, making it trivial for any entity with packet capture capabilities to read the transmitted data in clear text. This exposure is particularly critical given that AppScan often handles highly sensitive intellectual property and vulnerability reports from enterprise applications.
To mitigate this risk, organizations must ensure that all communications between the HCL AppScan Azure Boards Plugin and the AppScan server are enforced over HTTPS using valid TLS certificates. The vendor has addressed this issue by updating the plugin to actively detect when HTTP is being used for communication and displaying a prominent warning message to administrators. This change serves as both an immediate alert mechanism and a prompt to correct configuration errors. Administrators should review their deployment configurations immediately, ensuring that proxy settings or direct connection parameters specify HTTPS endpoints. Furthermore, it is recommended to implement network-level controls such as firewall rules that block outbound HTTP traffic on ports typically used for AppScan management interfaces, allowing only encrypted connections. Regular security audits and penetration testing of the integration points between Azure Boards and AppScan should be conducted to verify that no fallback mechanisms or misconfigurations allow unencrypted data transmission in production environments.