Superhuman (formerly Grammarly) Bug Bounty Program

Program Overview

Superhuman (formerly Grammarly) runs a bug bounty program on HackerOne. The program has 24 in-scope assets and is managed by HackerOne's triage team.

In-Scope Assets

Asset	Type	Max Severity	Eligible
*.coda.io	WILDCARD	Critical	Bounty
*.grammarly.com	WILDCARD	Critical	Bounty
*.grammarly.io	WILDCARD	Critical	Bounty
*.grammarlyaws.com	WILDCARD	Critical	Bounty
*.superhuman.com	WILDCARD	Critical	Bounty
Capture the Flag	OTHER	Critical	Bounty
Coda Chrome Extension	OTHER	High	Bounty
Grammarly Browser Extensions	OTHER	Critical	Bounty
Grammarly Desktop for Windows	DOWNLOADABLE_EXECUTABLES	Critical	Bounty
Grammarly Desktop for macOS	DOWNLOADABLE_EXECUTABLES	Critical	Bounty
Superhuman Go	OTHER	Critical	Bounty
app.grammarly.com	URL	Critical	Bounty
coda.grammarly.com	URL	Critical	Bounty
coda.io	URL	Critical	Bounty
codacontent.io	URL	Critical	Bounty
codahosted.io	URL	Critical	Bounty
com.grammarly.android.keyboard	GOOGLE_PLAY_APP_ID	Critical	Bounty
com.grammarly.keyboard	APPLE_STORE_APP_ID	Critical	Bounty
gateway.superhuman.com	URL	Critical	Bounty
id.superhuman.com	URL	Critical	Bounty
io.coda	APPLE_STORE_APP_ID	Critical	Bounty
io.coda.codaapp	GOOGLE_PLAY_APP_ID	Critical	Bounty
settings.superhuman.com	URL	Critical	Bounty
superhuman.com	URL	Critical	Bounty

Out-of-Scope Assets

• Superhuman Mail
• Third party external services
• status.coda.io

Tips for Hacking Superhuman (formerly Grammarly)

1. Read the policy — Understand what's in scope, out of scope, and any specific testing restrictions before you start.
2. Enumerate the attack surface — Use subdomain enumeration and directory bruteforcing to map all accessible endpoints.
3. Focus on high-impact bugs — Look for SQL injection, SSRF, and IDOR vulnerabilities first.
4. Test authentication flows — Check for OAuth misconfigurations and CSRF in login/signup flows.
5. Write clear reports — Include steps to reproduce, impact assessment, and suggested remediation. Use Burp Suite to capture evidence.

Frequently Asked Questions

How do I start hacking Superhuman (formerly Grammarly)?

Sign up on HackerOne, read the program policy carefully, review the in-scope assets listed above, and start testing. Always stay within scope and follow responsible disclosure guidelines.

Does Superhuman (formerly Grammarly) pay bounties?

Yes, Superhuman (formerly Grammarly) offers monetary rewards for valid security vulnerabilities.

What types of vulnerabilities does Superhuman (formerly Grammarly) accept?

Superhuman (formerly Grammarly) accepts reports for vulnerabilities found in their 24 in-scope assets. Common accepted vulnerability types include XSS, SQL injection, SSRF, IDOR, authentication bypass, and RCE. Check the program policy for specific exclusions.