CVE-2026-102669 in Joyland
Summary
by MITRE • 10/01/2026
Joyland AI app does not verify hostnames, allowing a malicious host to connect or intercept chat messages.
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Analysis
by VulDB Data Team • 10/01/2026
The vulnerability in the Joyland AI application stems from a fundamental failure in implementing proper TLS hostname verification during network communications. In secure software development, when an application establishes a connection over Transport Layer Security (TLS) or its predecessor Secure Sockets Layer (SSL), it is imperative that the client verifies that the certificate presented by the server matches the intended destination host. This process ensures that the encryption channel is established with the legitimate service provider and not with an imposter. By omitting this critical verification step, the application effectively disables one of the primary defenses against man-in-the-middle attacks, leaving the integrity and confidentiality of data transmissions entirely dependent on network infrastructure trust rather than cryptographic validation.
From a technical perspective, this flaw allows any entity capable of intercepting traffic or controlling DNS resolution to impersonate the Joyland AI service without detection. An attacker positioned between the client and the server can present a self-signed certificate or a valid certificate for their own domain, which the application will accept because it does not check if the hostname in the certificate matches the actual host being connected to. This behavior is characteristic of CWE-295 Improper Certificate Validation, specifically falling under subcategories related to missing hostname verification. The absence of this check means that even if encryption is technically present, the security guarantees provided by public key infrastructure are nullified because there is no assurance of server identity.
The operational impact of this vulnerability is severe, particularly given the sensitive nature of data typically exchanged with AI applications such as personal queries, private conversations, and potentially proprietary information. A malicious actor can perform a man-in-the-middle attack to intercept chat messages in transit. This interception allows for the unauthorized disclosure of confidential user data, violating privacy expectations and potentially exposing users to social engineering or identity theft if sensitive details are shared within those chats. Furthermore, because the application does not verify the host, an attacker could also inject malicious content into the conversation stream, altering responses from the AI model in real-time without either party realizing that they are no longer communicating with the legitimate service.
This type of vulnerability aligns closely with MITRE ATT&CK technique T1078 Valid Accounts or more specifically T1557 Adversary-in-the-Middle when considering how an attacker might position themselves to exploit this flaw, although it is primarily a configuration and implementation error rather than an active attack vector in itself. The lack of hostname verification also impacts the overall trust model of the application, making it susceptible to DNS hijacking or BGP route manipulation attacks where traffic can be rerouted to malicious servers that will accept connections without raising alarms within the app logic.
To mitigate this vulnerability, developers must enforce strict certificate validation by ensuring that the TLS library used in the Joyland AI app verifies that the server's certificate common name or subject alternative names match the expected hostname of the service endpoint. This should be implemented using standard cryptographic libraries that perform these checks automatically rather than relying on custom logic which may have gaps. Additionally, implementing Certificate Pinning can provide an additional layer of security by hardcoding the expected public key or certificate fingerprint within the application, ensuring that even if a fraudulent certificate is presented by a compromised CA or attacker, the connection will be rejected. Regular security audits and static code analysis focused on network communication modules are recommended to identify similar oversights in other parts of the application infrastructure.