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CVE-2025-12969 is an authentication bypass vulnerability in Fluent Bit's in_forward input plugin. Under certain configuration conditions, specifically when the forward input is configured with Security.Users authentication without the required Shared_Key, the plugin does not properly enforce authentication and silently accepts data without validating credentials. As a result, a Fluent Bit instance that appears to be protected by username/password authentication can in fact receive unauthenticated Forward protocol messages from remote sources. The flaw affects the integrity and trustworthiness of ingested telemetry by allowing forged log and event data to be submitted to the pipeline.
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An authentication bypass in Fluent Bit’s in_forward network input plugin where a specific configuration (security.users set) results in authentication not being performed, enabling unauthorized log injection/manipulation and related impacts.
A missing authentication control in Fluent Bit's in_forward plugin (Forward protocol) that enables unauthenticated log submission, false telemetry injection, and log flooding (potential DoS/operational impact).
Authentication bypass / missing authentication enforcement in Fluent Bit in_forward when configured with Security.Users without Shared_Key, allowing unauthenticated remote log injection/flooding despite appearing secured.
An authentication-bypass/misconfiguration-handling flaw in Fluent Bit forwarders where enabling Security.Users silently disables authentication, allowing remote injection of telemetry/logs and potential flooding of detection systems.
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