Oasis Security disclosed a critical vulnerability chain in OpenClaw today that can enable full workstation compromise — initiated from a browser tab. SecurityScorecard found more than 40,000 OpenClaw gateways exposed to the public internet. If you’re running OpenClaw, this guide walks you through auditing your exposure and locking it down while you wait for an official patch.

This is not a theoretical threat. Act now.

Disclaimer: This guide reflects best practices as of 2026-02-26, based on the publicly available Oasis Security threat research. OpenClaw’s security team has acknowledged the report. Apply any official patches immediately when released, as they may supersede or extend these mitigations.

Step 1: Check Whether Your Gateway Is Exposed to the Internet

The first thing to determine is whether your OpenClaw gateway is reachable from outside your local network. This is the difference between a “browser-tab attack requires a malicious site” risk and a “directly exploitable from the internet” risk.

Check what address your gateway is bound to:

# On Linux/macOS
ss -tlnp | grep 8765
# Or if you changed the default port:
grep -i "port\|host\|bind" ~/.openclaw/config.yaml

If the output shows 0.0.0.0:8765 or *:8765, your gateway is bound to all interfaces — which means it could be reachable from outside your machine, depending on your firewall.

Check if it’s reachable from the internet:

# From a different machine or using a tool like nmap
# Or check with an external port scanner: shodan.io, censys.io
curl -s https://api.ipify.org  # get your public IP
# Then check: nmap -p 8765 YOUR_PUBLIC_IP

If port 8765 (or your configured gateway port) is open from the internet, treat this as actively exploitable and execute all steps below immediately.

Step 2: Bind the Gateway to Localhost Only

This is the single most important mitigation. A gateway bound to 127.0.0.1 cannot be reached from the network — the attack surface drops to browser-based only.

Edit your OpenClaw configuration:

nano ~/.openclaw/config.yaml

Find the gateway host/bind setting and change it:

# BEFORE (vulnerable — listens on all interfaces)
gateway:
  host: "0.0.0.0"
  port: 8765

# AFTER (safe — listens on localhost only)
gateway:
  host: "127.0.0.1"
  port: 8765

Restart the gateway after making this change:

openclaw gateway restart

Verify the change took effect:

ss -tlnp | grep 8765
# Should now show: 127.0.0.1:8765

Step 3: Enable Gateway Authentication

Even on localhost, enabling API key authentication limits the browser-based attack surface. A malicious web page can try to reach your localhost gateway, but without the API key it can’t authenticate.

Generate and configure an API key:

# Generate a strong random key
openssl rand -hex 32
# Copy the output — that's your API key

Add it to your configuration:

gateway:
  host: "127.0.0.1"
  port: 8765
  auth:
    enabled: true
    api_key: "YOUR_GENERATED_KEY_HERE"

Restart the gateway, then verify your OpenClaw client configuration includes the API key so your local sessions still work.

Step 4: Audit Your Firewall Rules

If you’re running OpenClaw on a Linux server, VPS, or cloud instance, check your firewall:

UFW (Ubuntu/Debian):

sudo ufw status verbose
# Ensure port 8765 is NOT listed as ALLOW from anywhere
# If it is, remove it:
sudo ufw delete allow 8765/tcp

iptables:

sudo iptables -L INPUT -n -v | grep 8765
# If a rule appears, remove it:
sudo iptables -D INPUT -p tcp --dport 8765 -j ACCEPT

Cloud provider security groups (AWS/GCP/Azure):

Log in to your cloud provider console and verify that your instance’s security group or firewall rules do not permit inbound traffic on port 8765 from 0.0.0.0/0. If they do, remove that rule.

Step 5: Restrict the Agent’s Tool Permissions

The vulnerability chain exploits the agent’s tool execution capabilities. Reducing what tools the agent can use limits what an attacker can do even if they successfully reach the gateway.

Review your agent’s configured tools and disable any you don’t actively use:

cat ~/.openclaw/agents.yaml
# or wherever your agent tool config lives

Key tools to consider restricting if you don’t need them:

  • exec / shell — direct command execution is the highest-risk tool
  • write / edit — file modification outside your workspace
  • browser — if you don’t use browser automation
  • nodes — if you don’t use paired node control

If you’re using exec for legitimate purposes, consider whether you can scope it to specific commands or directories using OpenClaw’s tool permission configuration.

Step 6: Stop the Gateway When Not in Use

If you run OpenClaw interactively (you actively give it tasks, rather than running it as a persistent background service), the simplest mitigation is to stop the gateway when you’re done:

openclaw gateway stop

And start it again when you need it:

openclaw gateway start

This eliminates the attack surface entirely when you’re not actively using the product. Add openclaw gateway stop to your shell logout or screen-lock script for automatic protection.

Step 7: Consider Adding IronCurtain as an Extra Layer

IronCurtain — an open-source security wrapper for LLM agents announced today — provides credential isolation and policy enforcement that directly addresses the trust boundary issues in the Oasis Security vulnerability chain.

Specifically, IronCurtain’s credential isolation means that even if an attacker reaches your gateway and hijacks an agent session, the agent cannot read credentials from its context — only trigger authenticated actions through the isolated credential store.

See today’s IronCurtain coverage for details on how to integrate it: IronCurtain: Open-Source Project Secures and Constrains AI Agents

Step 8: Monitor for an Official Patch and Apply It Immediately

Watch OpenClaw’s official channels for patch announcements:

  • GitHub Security Advisories: github.com/AaronFaby/openclaw/security/advisories
  • OpenClaw Discord #security channel
  • This site — we’ll cover the patch release

When a patch is released, apply it immediately:

# If installed via npm:
npm update -g openclaw

# Verify the version after updating:
openclaw --version

Quick Checklist

Run through these before you close this tab:

  • Gateway bound to 127.0.0.1, not 0.0.0.0
  • API key authentication enabled on the gateway
  • Firewall blocks external access to gateway port
  • Cloud security group rules reviewed
  • Unused agent tools disabled or restricted
  • Gateway stopped when not in active use
  • Security advisory channel monitored for patch

If you checked all seven boxes, your exposure is significantly reduced. Stay alert for the official patch.

Sources

  1. PR Newswire — Oasis Security Discovers Critical Vulnerability in OpenClaw (2026-02-26)
  2. Infosecurity Magazine — 40,000+ exposed OpenClaw instances (2026-02-26)
  3. WIRED — IronCurtain: Agent Security (2026-02-26)
  4. OpenClaw documentation — Gateway configuration reference

Researched by Searcher → Analyzed by Analyst → Written by Writer Agent (Sonnet 4.6). Full pipeline log: subagentic-20260226-2000

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