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Block Sender

By Unstack Software LLC (DBA Block Sender) Vulnerability disclosure program on Self-hosted blocksender.io

Accepting reports Full safe harbor
Go to program Website
Top reward
No cash rewards
Top severity paid
Not published
Assets in scope
3
Public CVEs
0
Last change
No changes yet

At a glance

What to know before you start testing.

No cash rewards
A disclosure program: you report for credit, not money.
Report by email
[email protected]
Full safe harbor
Good-faith research is authorised; no legal action.
Publish after a fix
Coordinate the timing with the company.

Rewards

What the company's own policy page says it pays.

This program does not pay cash rewards.

Pays cash
No While we greatly appreciate vulnerability disclosures from the community, no compensation will be given.
Safe harbor
Full Block Sender will not file a lawsuit against you or report you to law enforcement assuming the vulnerability was reported responsibly and that it meets the following criteria.
Hall of fame
Yes Thank you to the following users and researchers for participating in our Vulnerability Disclosure Program!

Summarised with AI from the company's policy, read 12 Nov 2026, and checked word for word against it. Read the original

Scope

3 assets you may test, 9 excluded.

APIs 1

  • API

Products and areas 2

  • Chrome extension
  • dashboard
Out of scope (9)
  • Brute force attacks
  • Clickjacking on pages without authentication and/or sensitive state changes
  • Denial of Service (DoS)
  • Issues only present in deprecated browsers or plugins
  • Logout CSRF
  • Misconfigured flags on non-sensitive cookies
  • SSL vulnerabilities (i.e. misconfiguration or version)
  • User enumeration
  • Vulnerabilities that require users to perform highly unlikely actions (i.e. disabling browser security features, sending an attacker critical info, etc.)

Rules

What the policy asks of you, and the bug types it won't reward, quoted from Block Sender's policy.

While testing

  • Provide Block Sender with a reasonable time period to fix or address the issue before publicly disclosing.
  • In your research, please avoid any possible service disruption, accessing private user data, or destroying user data.
  • Do not submit reports from automated exploit scanning tools without first confirming the issue is in fact present.
  • Do not contact Block Sender employees or users for the purpose of phishing or social engineering.

Not accepted

  • Denial of Service (DoS)
  • SSL vulnerabilities (i.e. misconfiguration or version)
  • Brute force attacks
  • User enumeration
  • Misconfigured flags on non-sensitive cookies
  • Logout CSRF
  • Issues only present in deprecated browsers or plugins
  • Clickjacking on pages without authentication and/or sensitive state changes
  • Vulnerabilities that require users to perform highly unlikely actions (i.e. disabling browser security features, sending an attacker critical info, etc.)

Summarised with AI from the company's policy, read 12 Nov 2026, and checked word for word against it. Read the original

Changes

Tracked since 11 Nov 2026. Last checked 6 hours ago.

No changes yet. When the rewards or scope move, you will see it here and in the RSS feed.

Public CVEs

Published vulnerabilities in this vendor's products, from the NVD.

Search NVD

No CVEs matched yet. We match NVD records by vendor name, so products sold under another name can be missing.