Mailcow bug bounty programs
mailcow.email Updated
Mailcow runs one public program: a Sorona bug bounty paying up to $1,500.
- Top reward
- $1,500
- Sorona
- Programs
- 1
- 1 pays cash
- Targets in scope
- 11
- 2 types
- Last change
- None yet
- Tracked since Nov 2026
Where to report
The one public program Mailcow runs.
| Program | Critical | High | Medium | Low | Top reward | Safe harbor | KYC | First response | Status |
|---|---|---|---|---|---|---|---|---|---|
|
Mailcow
Sorona · Bug bounty |
– | – | – | $100 | $1,500 | Partial | – | – | Open |
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- Critical
- –
- High
- –
- Medium
- –
- Low
- $100
- Safe harbor
- Partial
Amounts are the top reward per severity in the currency each program pays. First response is the platform's measured average when it publishes one, else what the policy promises.
What is in scope
11 targets. 6 excluded.
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https://mailcow.email
Web
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Aliases, forwarding hosts, relay settings and everything else deciding where mail leaves this server for
Products and areas
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Autodiscover and autoconfig, the endpoints a mail client hits before it has been configured and which answer without authentication
Products and areas
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Logging and log display: the login history, the autodiscover log and every other view rendering data a remote party supplied
Products and areas
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The authorization model across the three panel levels, covering what a domain admin or a mailbox user can reach of another tenant's configuration
Products and areas
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The container orchestration mailcow ships: the compose definitions, the entrypoint scripts, the update mechanism and the secrets passed between containers
Products and areas
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The mailcow API, including API-key authentication and every endpoint that creates, modifies or deletes a mail object
Products and areas
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The mailcow UI in full: the administrator panel, the domain-admin panel and the mailbox-user panel, three different privilege levels on the same application
Products and areas
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The policy asks for security vulnerabilities by email to the mailcow team and describes a coordinated fix process. It draws no boundary narrower than the stack mailcow ships, so everything mailcow itself writes or wires together is inside it
Products and areas
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The quarantine interface, where an administrator reads attacker-supplied subject lines, sender addresses and attachment filenames inside a privileged browser session
Products and areas
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Two-factor handling, app passwords and the session machinery behind the panels
Products and areas
No target matches. Try part of a host name, such as the company name.
Out of scope 6
Don't test these. A program can exclude a host another program covers; the program you report to decides.
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Defects inside the bundled upstreams themselves. Postfix, Dovecot, rspamd, SOGo and ClamAV are separate projects with separate maintainers, and a bug in their code is their report
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Missing security headers and scanner output with no demonstrated impact, which on a panel this size is a very large category
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Operator configuration, including a panel exposed without a reverse proxy, weak administrator passwords or a deliberately open relay
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Outdated deployments. mailcow updates in place and the published advisories all assume a current stack
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The Docker daemon, the host operating system and the TLS termination an operator put in front of the stack
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Volumetric denial of service against a mail server that accepts mail from strangers by design
Recent changes
Reward and scope changes across every Mailcow program, newest first.
No changes recorded yet. New targets and reward moves show up here and in the RSS feed.
Recent CVEs
Published vulnerabilities in Mailcow products, from the NVD.
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CVE-2025-53909 Critical
mailcow: dockerized is an open source groupware/email suite based on docker. A Server-Side Template Injection (SSTI) vulnerability exists in versions prior to 2025-07 in the notification template system used by mailcow for sending quota and quarantine alerts. The template rendering engine allows template expressions that may be abused to execute code in certain contexts. The issue requires admin-l
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CVE-2025-25198 High
mailcow: dockerized is an open source groupware/email suite based on docker. Prior to version 2025-01a, a vulnerability in mailcow's password reset functionality allows an attacker to manipulate the `Host HTTP` header to generate a password reset link pointing to an attacker-controlled domain. This can lead to account takeover if a user clicks the poisoned link. Version 2025-01a contains a patch.
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CVE-2024-41958 Medium
mailcow: dockerized is an open source groupware/email suite based on docker. A vulnerability has been discovered in the two-factor authentication (2FA) mechanism. This flaw allows an authenticated attacker to bypass the 2FA protection, enabling unauthorized access to other accounts that are otherwise secured with 2FA. To exploit this vulnerability, the attacker must first have access to an account
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CVE-2024-41959 High
mailcow: dockerized is an open source groupware/email suite based on docker. An unauthenticated attacker can inject a JavaScript payload into the API logs. This payload is executed whenever the API logs page is viewed, potentially allowing an attacker to run malicious scripts in the context of the user's browser. This could lead to unauthorized actions, data theft, or further exploitation of the a
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CVE-2024-41960 Low
mailcow: dockerized is an open source groupware/email suite based on docker. An authenticated admin user can inject a JavaScript payload into the Relay Hosts configuration. The injected payload is executed whenever the configuration page is viewed, enabling the attacker to execute arbitrary scripts in the context of the user's browser. This could lead to data theft, or further exploitation. This i
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CVE-2024-30270 Medium
mailcow: dockerized is an open source groupware/email suite based on docker. A security vulnerability has been identified in mailcow affecting versions prior to 2024-04. This vulnerability is a combination of path traversal and arbitrary code execution, specifically targeting the `rspamd_maps()` function. It allows authenticated admin users to overwrite any file writable by the www-data user by ex
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CVE-2024-31204 Medium
mailcow: dockerized is an open source groupware/email suite based on docker. A security vulnerability has been identified in mailcow affecting versions prior to 2024-04. This vulnerability resides in the exception handling mechanism, specifically when not operating in DEV_MODE. The system saves exception details into a session array without proper sanitization or encoding. These details are later
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CVE-2024-24760 High
mailcow is a dockerized email package, with multiple containers linked in one bridged network. A security vulnerability has been identified in mailcow affecting versions < 2024-01c. This vulnerability potentially allows attackers on the same subnet to connect to exposed ports of a Docker container, even when the port is bound to 127.0.0.1. The vulnerability has been addressed by implementing addit
About this page
This page gathers every public program listed under mailcow.email: platform programs, self-hosted policies and security.txt contacts. Each program's own policy decides what is in scope and what it pays; check it before you test.
Something wrong or missing? Report a correction.