CVE-2026-108863 in Plano
Summary
by MITRE • 10/11/2026
Katanemo Plano through 0.4.37 contains a missing authentication vulnerability that allows unauthenticated network attackers to access the Envoy admin interface, which is bound to all host interfaces on port 9901. Attackers can request the /config_dump endpoint to read configured LLM provider API keys in plaintext from the WASM filter configuration.
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Analysis
by VulDB Data Team • 10/11/2026
The vulnerability identified in Katanemo Plano versions through 0.4.37 represents a critical security misconfiguration involving the Envoy proxy administration interface. The core issue stems from the absence of authentication mechanisms for the admin endpoint, which is bound to all network interfaces on port 9901 by default. This configuration exposes internal management capabilities to any entity capable of reaching the host over the network, effectively bypassing standard access controls that should restrict administrative operations to trusted local or authorized remote sources only.
From a technical perspective, the flaw allows unauthenticated attackers to interact with the Envoy admin API without providing credentials. Specifically, the exploitation vector targets the /config_dump endpoint, which is designed for debugging and monitoring purposes but inadvertently reveals sensitive configuration data when accessed by unauthorized parties. By querying this endpoint, an attacker can retrieve the complete runtime configuration of the proxy, including details about WebAssembly filters that process traffic before it reaches backend services.
The operational impact of this vulnerability is severe due to the nature of the exposed data. The config dump includes plaintext representations of API keys for Large Language Model providers configured within the system. Since these credentials are stored in plain text rather than being encrypted or protected by secret management systems, their exposure leads directly to credential compromise. An attacker who obtains these keys can impersonate legitimate services, incur unauthorized costs through API usage, access proprietary data processed by the LLMs, and potentially pivot further into connected infrastructure depending on the permissions associated with those keys.
This vulnerability aligns closely with CWE-287, which describes Improper Authentication, as well as CWE-359, Exposure of Private Information to an Unauthorized Actor. In terms of offensive security frameworks such as MITRE ATT&CK, this behavior corresponds to techniques involving Discovery and Credential Access, specifically leveraging exposed administrative interfaces to gather intelligence and steal secrets for lateral movement or persistent access.
To mitigate this risk, immediate remediation is required by updating Katanemo Plano to a version later than 0.4.37 where the default binding of the admin interface has been corrected or secured. In environments where upgrading is not immediately feasible, network-level controls should be implemented to restrict access to port 9901 exclusively from trusted management networks using firewall rules or security groups. Additionally, enabling authentication for the Envoy admin interface via TLS client certificates or token-based authorization provides a robust defense-in-depth measure. It is also critical to audit configuration files to ensure that sensitive API keys are not stored in plaintext and instead utilize secure secret injection mechanisms provided by modern proxy architectures.