CVE-2026-88062: OmniRoute ACP Custom-Agent Remote Code Execution (RCE)

POST /api/acp/agents registers a custom ACP agent. The endpoint accepts user-controlled binary and versionCommand values. After saving the custom agent, the same request calls refreshAgentCache(), which triggers agent version detection. The version probe eventually runs:

execFileSync(probe.command, probe.args, ...)

The only validation is resolveVersionProbe(binary, versionCommand, true), which checks that the first token of versionCommand matches the request-provided binary. Because binary is also attacker-controlled, an attacker can submit:

{
"binary": "node",
"versionCommand": "node -e \"...arbitrary JavaScript...\""
}

This executes arbitrary Node.js code inside the server container, and that code can execute OS commands via child_process.execSync().

When requireLogin=false, isAuthenticated() treats anonymous requests as authenticated. At the same time, /api/acp/ is not included in LOCAL_ONLY_API_PREFIXES or SPAWN_CAPABLE_PREFIXES, so the endpoint is not blocked by the LOCAL_ONLY policy before reaching the anonymous allow branch. As a result, a remote anonymous attacker can execute commands inside the OmniRoute container with a single HTTP request.