ownCloud - Bug Bounty Program

Dear Hunters,
Thank you for your passion and dedication to our bug bounty program. We would like to let you know that our internal evaluation team will not be fully staffed during the holiday season. We will continue to collect your reports, but we will suspend evaluation until CW02 (January 6th). After that, we will resume processing reports, and it may take a few days to respond to your findings.
Please be assured that we will evaluate all reports and continue to maintain the program in 2025.

Have a great holiday season and see you in 2025!
Your ownCloud Security Team

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About

ownCloud

We created the ownCloud Security Bug Bounty Program to reward security researchers for finding issues in the ownCloud Server, and in so doing help strengthen ownCloud Server for customers, users and the community.

Program Rules

Testing Policy and Responsible Disclosure

Please adhere to the following rules while performing research on this program:

• Denial of service (DoS) attacks on ownCloud applications, servers, networks or infrastructure are strictly forbidden.
• Avoid tests that could cause degradation or interruption of our services.
• Do not use automated scanners or tools that generate large amount of network traffic.
• Do not leak, manipulate, or destroy any user data or files in any of our applications/servers.
• Do not copy any files from our applications/servers and disclose them.
• No vulnerability disclosure, full, partial or otherwise, is allowed.

Reward Eligibility

We are happy to thank everyone who submits valid reports which help us improve the security of ownCloud, however only those that meet the following eligibility requirements may receive a monetary reward:

• You must be the first reporter of a vulnerability.
• The vulnerability must be a qualifying vulnerability (see below).
• The report must contain the following elements:
  • Clear textual description of the vulnerability, how it can be exploited, the security impact it has on the application, its users and ownCloud, and remediation advice on fixing the vulnerability
  • Proof of exploitation: screenshots demonstrating the exploit was performed, and showing the final impact
  • Provide complete steps with the necessary information to reproduce the exploit, including (if necessary) code snippets, payloads, commands etc
• You must not break any of the testing policy rules listed above
• You must not be a former or current employee of ownCloud or one of its contractors.

Reward amounts are based on:

• Reward grid of the report's scope
• CVSS scoring and actual business impact of the vulnerability upon performing risk analysis

If the bug is identified as meaningful and qualifies for the program, and the reporter has followed the Disclosure Policy, the bug bounty is paid out on the following schedule by bug severity:

Impact	Definition	Reward
Critical	Gaining remote code execution on the server as a non-admin user. (i.e. RCE)	$3000 - $5000
High	Gaining access to complete user data of any other user. (i.e. Auth Bypass) or SQL Injection with critical effects	$1000 - $3000
Medium	Allowing the adversary to gain complete control over a single user session. (Stored XSS with CSP bypass / Critical CSRF / …)	$500 - $1000
Low	Vulnerabilities that can only be exploited in very rare cases or have marginal impact. (High amount of unlikely user interaction / …)	$50 - $500

The severity of the bug is determined at the discretion of ownCloud and the ownCloud security team.
All bounties will be paid using YesWeHack platform.

Complements about our scopes

Desktop Client

• Issues affecting the Desktop Client available from https://owncloud.org/install/#install-clients
• Source: https://github.com/owncloud/client

Note that the ownCloud server itself is considered a trusted endpoint in our threat model and an eligible vulnerability must not rely on a malicious ownCloud instance.

com.owncloud.android

• Our official Android client from https://play.google.com/store/apps/details?id=com.owncloud.android.
• Source: https://github.com/owncloud/android

Note that the ownCloud server itself is considered a trusted endpoint in our threat model and an eligible vulnerability must not rely on a malicious ownCloud instance.

owncloud.iosapp

• Our official iOS client from https://apps.apple.com/app/id1359583808
• Source: https://github.com/owncloud/ios-app

Note that the ownCloud server itself is considered a trusted endpoint in our threat model and an eligible vulnerability must not rely on a malicious ownCloud instance.

owncloud/customgroups

• Code from: https://github.com/owncloud/customgroups
  This apps makes it possible for users to create their own custom groups and manage members. It is then possible to share files or folders with these groups.

owncloud/guests

• Code from: https://github.com/owncloud/guests

Create a guest user by typing his name in to the sharing dialog. The guest will receive an email invite with a link to create an account. He only has access to files which are shared with him.

owncloud/richdocuments

• Code from: https://github.com/owncloud/richdocuments

Collabora Online for ownCloud provides collaborating editing functions for text documents, spreadsheets and presentations inside ownCloud for improved productivity.

owncloud/notifications

• Code from: https://github.com/owncloud/notifications

Notification backend and UI for the notification panel/icon. Used for notifications of other apps (announcementcenter, federatedfilesharing etc.)

owncloud/core

• Code from: https://github.com/owncloud/core

This is our core server software, which is "the heart" of owncloud.
Note that some folders such as tests and so on will not be packaged. Please make sure that the referenced file is thus also existent in our final releases.

owncloud/gallery

• Code from: https://github.com/owncloud/gallery

Media gallery for ownCloud which includes previews for all media types supported by your installation.
Provides a dedicated view of all images in a grid, adds image viewing capabilities to the files app and adds a gallery view to public links.

owncloud/ocis

• Code from: https://github.com/owncloud/ocis

This is next generation server software, which is "the new heart" of owncloud.
Note that some folders such as tests and so on will not be packaged. Please make sure that the referenced file is thus also existent in our final releases.

owncloud/web

• Code from: https://github.com/owncloud/web

This is the web application for the next generation server software, ownCloud Infinite Scale.

owncloud/web-extensions

• Code from: https://github.com/owncloud/web-extensions

Additional web apps for ownCloud Infinite Scale

owncloud/user_ldap

• Code from: https://github.com/owncloud/user_ldap

This application enables administrators to connect ownCloud to an LDAP-based user directory for authentication and provisioning users, groups and user attributes. Admins can configure this application to connect to one or more LDAP directories or Active Directories via an LDAP interface. Attributes such as user quota, email, avatar pictures, group memberships and more can be pulled into ownCloud from a directory with the appropriate queries and filters.

owncloud/oauth2

• Code from: https://github.com/owncloud/oauth2

Application for using OAuth 2.0 in ownCloud

owncloud/openidconnect

• Code from: https://github.com/owncloud/openidconnect

OpenID Connect integration for ownCloud 10

owncloud/activity

• Code from: https://github.com/owncloud/activity

Provides an activity feed showing your file changes and other interesting things going on in your ownCloud.

owncloud/impersonate

• Code from https://github.com/owncloud/impersonate

Administrators can impersonate the identity of other users. This is usually used to handle support cases.

owncloud/updater

• Code from: https://github.com/owncloud/updater

owncloud/files

• Code from: https://github.com/owncloud/core/tree/master/apps/files

This is the app for owncloud file management.