waha

WAHA Security Hardening Guide

Least-privilege permissions

• Run WAHA with minimal system access: Configure it to use a dedicated user account that only accesses WhatsApp data directories—never grant admin/root privileges or unnecessary file/database access.
• Restrict API token scope: Generate separate API tokens for different applications connecting to WAHA; rotate them monthly and immediately revoke any unused tokens (like those for testing or deprecated integrations).
• Limit message retention: Configure WAHA to delete stored session files and message logs after a set period (e.g., 7-30 days) rather than keeping indefinite archives.
• Control who deploys updates: Only authorized DevOps or security staff should install new WAHA versions; require approval workflow before applying patches.

Network isolation

• Deploy behind a firewall: Only expose WAHA's REST API to trusted internal networks or through a VPN—never directly to the public internet without authentication.
• Use encrypted connections (HTTPS/TLS): Enable SSL certificates for all API traffic so WhatsApp credentials and messages are scrambled in transit; treat HTTP-only deployments as security failures.
• Isolate the database: Store WAHA's session tokens and message data on a separate encrypted database server, not on the same machine as the API endpoint; restrict database access by IP address.
• Disable unnecessary ports: Only open the specific WAHA port needed (e.g., 3000); close all other ports to prevent attackers from finding other entry points.

Monitoring

• Alert on failed authentication: Set up automated alerts if someone repeatedly tries to access WAHA's API with wrong credentials or if session tokens are rejected.
• Track API usage patterns: Log all API requests (who called it, when, what message was sent) and review weekly for unusual activity like messages sent outside business hours or to unexpected recipients.
• Watch for dependency vulnerabilities: Subscribe to security advisories for WAHA's underlying libraries (Node.js, Go packages); plan updates within 48 hours of critical patches being released.
• Monitor session file activity: Alert if WhatsApp session tokens are accessed or copied to unusual locations, which could signal credential theft.

Red flags to watch for

• WhatsApp updates break message sending: If WAHA suddenly stops working after WhatsApp app updates, this signals the reverse-engineered protocol is fragile; immediately revert to a stable version and file backup communication plans.
• Unauthorized API calls or new tokens created: If you see API requests you didn't authorize or API tokens appearing in logs that your team didn't generate, assume account compromise and revoke all tokens immediately.
• Plaintext credentials in logs or backups: If you find session tokens, passwords, or WhatsApp cookies visible in system logs, backups, or error messages, treat it as a data breach—rotate all credentials and review what was exposed.
• Performance degradation or unusual resource consumption: A sudden spike in CPU, memory, or network traffic may indicate malware using WAHA to send spam or stolen credentials being exfiltrated; isolate the system and investigate immediately.