lemlist Vulnerability Disclosure Program

Program Overview

lemlist runs a vulnerability disclosure program on HackerOne. The program has 5 in-scope assets.

In-Scope Assets

Asset	Type	Max Severity	Eligible
app.lemcal.com	URL	Critical	No Bounty
app.lemlist.com	URL	Critical	No Bounty
app.lemwarm.com	URL	Critical	No Bounty
app.taplio.com	URL	Critical	No Bounty
app.tweethunter.io	URL	Critical	No Bounty

Out-of-Scope Assets

• api.lemlist.com
• api.taplio.com
• api.tweethunter.io
• lemwarm.com
• taplio.com
• tweethunter.io
• www.lemcal.com
• www.lemlist.com

Tips for Hacking lemlist

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 lemlist?

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 lemlist pay bounties?

No, lemlist runs a Vulnerability Disclosure Program (VDP) without monetary rewards. You may receive recognition or swag.

What types of vulnerabilities does lemlist accept?

lemlist accepts reports for vulnerabilities found in their 5 in-scope assets. Common accepted vulnerability types include XSS, SQL injection, SSRF, IDOR, authentication bypass, and RCE. Check the program policy for specific exclusions.