Callsign Vulnerability Disclosure Program

Program Overview

Callsign runs a vulnerability disclosure program on HackerOne. The program has 5 in-scope assets and is managed by HackerOne's triage team.

In-Scope Assets

Asset	Type	Max Severity	Eligible
*.s02.callsign.com	WILDCARD	Critical	No Bounty
app.s02.callsign.com	URL	Critical	No Bounty
b2b.s02.callsign.com	URL	Critical	No Bounty
com.callsign.app.android	GOOGLE_PLAY_APP_ID	Critical	No Bounty
southfields-v2.s02.t00-csglobal.a2develop.com	URL	Low	No Bounty

Out-of-Scope Assets

• connector.callsign.com
• dashboard.callsign.com
• pathway.callsign.com
• portal.callsign.com
• programs.callsign.com
• support.callsign.com
• www.callsign.com

Tips for Hacking Callsign

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 Callsign?

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 Callsign pay bounties?

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

What types of vulnerabilities does Callsign accept?

Callsign 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.