GitHub Security Bug Bounty

Software security researchers are increasingly engaging with internet companies to hunt down vulnerabilities. Our bounty program gives a tip of the hat to these researchers and provides rewards of $30,000 or more for critical vulnerabilities.

If you have found a vulnerability, submit it here.

You can find useful information in our rules, scope, targets and FAQ sections.

Happy hacking!


These are the current top 10 bounty hunters based on total points earned across all targets. For the full list of contributors, check out GitHub’s bounty hunters.

1 adob 30,750 pts Aleksandr Dobkin<img src=404 onerror=alert(document.domain)> @adob
2 joernchen 28,500 pts joernchen @joernchen
3 staaldraad 20,000 pts Etienne Stalmans @staaldraad
4 Cache-Money 16,000 pts Tanner @Cache-Money
5 jkakavas 15,600 pts Ioannis Kakavas @jkakavas
6 kyprizel 14,000 pts kyprizel @kyprizel
7 orangetw 12,500 pts Orange Tsai @orangetw
8 kamilhism 10,200 pts Kamil Hismatullin @kamilhism
9 Vlaaaaaaad 10,000 pts Vlad Ionescu @Vlaaaaaaad
10 vyshakh 10,000 pts Vyshakh Parakkat @vyshakh


Before you start
  • Check the list of domains that are in scope for the Bug Bounty program and the list of targets for useful information for getting started.

  • Check the list of bugs that have been classified as ineligible. Submissions which are ineligible will likely be closed as Not Applicable.

  • Check the GitHub Changelog for recently launched features.

  • Never attempt non-technical attacks such as social engineering, phishing, or physical attacks against our employees, users, or infrastructure.

  • When in doubt, contact us at

  • By participating in GitHub’s Bug Bounty program (the “Program”), you acknowledge that you have read and agree to GitHub’s Terms of Service as well as the following:

    • you are not currently a GitHub employee or contractor, were not a GitHub employee or contractor within six months prior to submission, and you did not collaborate on your submission with anyone who was.

    • your participation in the Program will not violate any law applicable to you, or disrupt or compromise any data that is not your own.

    • you are solely responsible for any applicable taxes, withholding or otherwise, arising from or relating to your participation in the Program, including from any bounty payments.

    • GitHub reserves the right to terminate or discontinue the Program at its discretion.

    • Only test for vulnerabilities on sites you know to be operated by GitHub and are in-scope. Some sites hosted on subdomains of are operated by third parties and should not be tested.

    • We cannot reward any individual on any U.S. sanctions list, or any individual residing in any U.S.-sanctioned country or region. For more information, please see

Legal safe harbor

Your research is covered by the GitHub Bug Bounty Program Legal Safe Harbor policy. In summary:

  • We consider security research and vulnerability disclosure activities conducted consistent with this policy as “authorized” conduct under the Computer Fraud and Abuse Act, the DMCA, and other applicable computer use laws such as Cal. Penal Code 502(c). We waive any potential DMCA claim against you for circumventing the technological measures we have used to protect the applications in this bug bounty program’s scope.

  • We want you to responsibly disclose through our bug bounty program, and don’t want researchers put in fear of legal consequences because of their good faith attempts to comply with our bug bounty policy. We cannot bind any third party, so do not assume this protection extends to any third party. If in doubt, ask us before engaging in any specific action you think might go outside the bounds of our policy.

  • Because both identifying and non-identifying information can put a researcher at risk, we limit what we share with third parties. We may provide non-identifying substantive information from your report to an affected third party, but only after notifying you and receiving a commitment that the third party will not pursue legal action against you. We will only share identifying information (name, email address, phone number, etc.) with a third party if you give your written permission.

  • If your security research as part of the bug bounty program violates certain restrictions in our site policies, the safe harbor terms permit a limited exemption.

Performing your research
  • Do not impact other users with your testing, this includes testing vulnerabilities in repositories or organizations you do not own. If you are attempting to find an authorization bypass, you must use accounts you own.

  • The following are never allowed and are ineligible for reward. We may suspend your GitHub account and ban your IP address for:

    • Performing distributed denial of service (DDoS) or other volumetric attacks
    • Spamming content
    • Large-scale vulnerability scanners, scrapers, or automated tools which produce excessive amounts of traffic.
      • Note: We do allow the use of automated tools so long as they do not produce excessive amounts of traffic. For example, running one nmap scan against one host is allowed, but sending 65,000 requests in two minutes using Burp Suite Intruder is excessive.
  • Researching denial-of-service attacks is allowed and eligible for rewards only if you follow these rules:

    • There are no limits for researching denial of service vulnerabilities against your own instance of GitHub Enterprise Server. We strongly recommend/prefer this method for researching denial of service issues.
    • If you choose to test on GitHub proper (i.e.
      • Research must be performed in organizations or repositories you own
      • Stop immediately if you believe you have affected the availability of our services. Don’t worry about demonstrating the full impact of your vulnerability, GitHub’s security team will be able to determine the impact.
Handling personally identifiable information (PII)
  • Personally identifying information (PII) includes:
    • legal and/or full names
    • names or usernames combined with other identifiers like phone numbers or email addresses
    • health or financial information (including insurance information, social security numbers, etc.)
    • information about political or religious affiliations
    • information about race, ethnicity, sexual orientation, gender, or other identifying information that could be used for discriminatory purposes
  • Do not intentionally access others’ PII. If you suspect a service provides access to PII, limit queries to your own personal information.

  • Report the vulnerability immediately and do not attempt to access any other data. The GitHub Security team will assess the scope and impact of the PII exposure.

  • Limit the amount of data returned from services. For SQL injection, for example, limit the number of rows returned

  • You must delete all your local, stored, or cached copies of data containing PII as soon as possible. We may ask you to sign a certificate of deletion and confidentiality agreement regarding the exact information you accessed. This agreement will not affect your bounty reward.

  • We may ask you for the usernames and IP addresses used during your testing to assess the impact of the vulnerability
Reporting your vulnerability
  • Submissions must include written instructions for reproducing the vulnerability. Submissions without clear reproduction steps or which only include reproduction steps in video form may be ineligible for a reward.

  • When reporting vulnerabilities you must keep all information on HackerOne. Do not post information to video-sharing or pastebin sites. Videos and images can be uploaded directly via HackerOne.

  • For vulnerabilities involving personally identifiable information, please explain the kind of PII you believe is exposed and limit the amount of PII data included in your submissions. For textual information and screenshots, please only include redacted data in your submission.

  • During the course of an investigation, it may take time to resolve the issue you have reported. We ask that you refrain from publicly disclosing details regarding an issue you’ve reported until the fix has been publicly made available.

Receiving your award
  • All reward amounts are determined by our severity guidelines.

  • When duplicates occur, we only award the first report that was received (provided that it can be fully reproduced).

  • You are free to publish write-ups about your vulnerability and GitHub will not limit what you write. We may pay out your reward before the vulnerability is patched so we may ask that you delay publishing to keep other GitHub users safe.

  • Medium, high, and critical severity issues may be written up on the GitHub Bug Bounty site and included in our leaderboard. We do not currently post write-ups for low severity vulnerabilities.

  • GitHub is a CVE Numbering Authority (CNA) for GitHub Enterprise Server. Eligible Bug Bounty submissions that affect GitHub Enterprise Server may be assigned CVEs. These CVEs will be shared with submitters via HackerOne, included in bounty write-ups and listed in the GitHub Enterprise Server release notes.

  • If you would prefer to donate your bounty reward to an established 501(c)(3) charitable organization, GitHub will match your donation. In order to donate your reward and have it matched, submit a support ticket to HackerOne with the following information:

    • the report ID for which you want to donate the bounty;
    • the name and website of the charity you want to donate to;
    • that you would like the donation matched using GitHub’s process; and
    • whether you want to be named as the donor or would prefer to remain anonymous. Keep in mind that we can only attribute the donation to you if the charity allows us to give a name.


In addition to our scope, we want to share a high-level overview of GitHub's services:

Core GitHub services available to all users

On-premise and hosted GitHub for enterprise customers

GitHub Apps that are owned and operated by GitHub

First-party clients for accessing GitHub

Other GitHub services

Infrastructure owned and operated by GitHub



GitHub runs a number of services but only submissions under the following domains are eligible for rewards. Any GitHub-owned domains not listed below are not in scope, not eligible for rewards, and not covered by our legal safe harbor.

This is our main domain for hosting user-facing GitHub services. All subdomains under are in-scope except:
  • *
  • *
  • *

This is our domain for hosting static assets. All subdomains under are in-scope.

This is our domain for hosting and rendering users’ data. All subdomains under are in-scope.

This is our domain for hosting employee-facing services. All subdomains under are in-scope except:

This is our domain for receiving webhooks for employee-facing services. All subdomains under are in-scope.

This is our domain for hosting GitHub’s internal production services. Many of these services are not accessible from outside our internal network. All subdomains under are in-scope.

This is our main domain for Semmle and LGTM services. All subdomains under are in-scope except:

This is our domain for non-production Semmle services. All subdomains under are in-scope.

This is our domain for serving LGTM downloads. All subdomains under are in-scope.

This is an instance of LGTM especially for Bug Bounty research. All subdomains under are in-scope.

This is an instance of LGTM’s backend used for triggering automated tasks. All subdomains under are in-scope.

This is the domain for npm’s public-facing websites. All subdomains under are in-scope.

This is the domain for npm’s registry, public-facing databases, and APIs. All subdomains under are in-scope.

Severity Guidelines

All bounty submissions are rated by GitHub using a purposefully simple scale. Each vulnerability is unique, but the following is a rough guideline we use internally for rating and rewarding submissions:

$20,000 - $30,000+

Critical severity issues present a direct and immediate risk to a broad array of our users or to a GitHub product itself. They often affect relatively low-level/foundational components in one of our application stacks or infrastructure. For example:

  • arbitrary code/command execution on a server in our production network
  • arbitrary SQL queries on a production database
  • bypassing the login process, either password or 2FA
  • access to sensitive production user data or access to internal production systems
  • accessing another user’s data in the GitHub Actions service

The upper bound for critical vulnerabilities, $30,000, is only a guideline, and GitHub may reward higher amounts for exceptional reports.

$10,000 - $20,000

High severity issues allow an attacker to read or modify highly sensitive data that they are not authorized to access. They are generally more narrow in scope than critical issues, though they may still grant an attacker extensive access. For example:

  • injecting attacker controlled content into (XSS) that bypasses CSP
  • bypassing authorization logic to grant a repository or package collaborator more access than intended
  • discovering sensitive user or GitHub data in a publicly exposed resource, such as an S3 bucket
  • overwriting a customer repository or package that should be inaccessible
  • gaining access to a non-critical resource that only employees should be able to reach
  • using the GitHub Actions repo-scoped GitHub token to access high-risk private content outside of that repository
  • sending authentication credentials from a client app to an unintended server
  • code execution in a client app that requires no user interaction, such as arbitrary code execution upon repo clone, package install with the --ignore-scripts flag, or via a protocol handler

$4,000 - $10,000

Medium severity issues allow an attacker to read or modify limited amounts of data that they are not authorized to access. They generally grant access to less sensitive information than high severity issues. For example:

  • disclosing the title of issues in private repositories, which should be be inaccessible
  • injecting attacker controlled content into (XSS) but not bypassing CSP or executing sensitive actions with another user’s session
  • bypassing CSRF validation for low risk actions, such as starring a repository or unsubscribing from a mailing list
  • escaping the LGTM worker sandbox to access other users’ data or private networked resources
  • code execution in a client app that requires minimal, expected user interaction, such as performing actions on a repository or with a package that a user would not expect to lead to code execution
  • package integrity compromise, i.e., downloading a package that does not match the integrity as defined in package-lock.json

$617 - $2,000

Low severity issues allow an attacker to access extremely limited amounts of data. They may violate an expectation for how something is intended to work but allow nearly no escalation of privilege or ability to trigger unintended behavior by an attacker. For example:

  • signing up arbitrary users for access to an “early access feature” without their consent
  • creating an issue comment that bypasses our image proxying filter by providing a malformed URL
  • triggering verbose or debug error pages without proof of exploitability or obtaining sensitive information
  • triggering application exceptions that could affect many users
  • triggering XSS or CSRF vulnerabilities in LGTM
  • injecting JavaScript event handlers into links, etc., that are mitigated by CSP on
  • disclosing the existence of a private package on npm that should be inaccessible
  • novel supply chain vulnerabilities that affect a GitHub product but are not solely limited to that product
  • credentials such as those from the .npmrc file or from GitHub Enterprise Server being leaked in logs


How is the bounty reward determined?

Our security and development teams take many factors into account when determining a reward. These factors include the complexity of successfully exploiting the vulnerability, the potential exposure, as well as the percentage of impacted users and systems. Sometimes an otherwise critical vulnerability has a very low impact simply because it is mitigated by some other component, e.g. requires user interaction, an obscure web browser, or would need to be combined with another vulnerability that does not currently exist. Additionally, at least two GitHub security engineers agree on the severity and amount before a payout is made.

Can I submit a video proof-of-concept?

You can certainly attach a video if you believe it will clarify your submission. However, all submissions must also include step-by-step instructions to reproduce the bug. The security team will let you know if we think a video will clarify your report. Submissions which only include video reproduction steps will have a longer response time and we may close your submission as Not Applicable.

Did my submission just get rejected by a bot?

You may get a response that appears to be from a bot. The bot does some work for us, but only when we tell it to. We “do our own stunts” at GitHub Security. An application security engineer at GitHub triages each submission. In most cases, we use the bot to automate messaging and other tasks for us. Rest assured, a human did look at your submission.

Can I submit my report via a third-party or vulnerability broker?

GitHub’s Bug Bounty program is designed to both reward individual researchers and increase the security of all GitHub users. We don’t believe that disclosing GitHub vulnerabilities to third parties achieves either of those goals. As a result, any vulnerabilities that are disclosed to third-party before being submitted to our program are ineligible for rewards.

What are points?

In addition to giving researchers money, we are trying to make this fun. We assign a point value to each vulnerability and list it on this site. The researchers with the most points are listed on our leaderboard. While we use many of the same metrics when determining point value as for dollar value, other non-tangible factors are considered as well. For example, if you provide an awesome writeup of a vulnerability with a functional POC that will be factored in.

What if I do not want my submission published on the bounty website or do not have a GitHub account?

Please still send us your vulnerability! We will only publish your submission after your approval. To be visible within the leaderboard you must provide us with a GitHub username. This allows us to link submissions to a single user and generate your sweet profile page.

Why does severity on HackerOne not match the reward I was given?

We do not always update HackerOne with the assessed severity because we track that information internally. Our payout guidelines and the value of the reward dictate our assessment of severity, not the severity on HackerOne.

Where is your PGP key? I want to use it when I submit a vulnerability.

If you absolutely believe encrypting the message is necessary, please read our instructions and caveats for PGP submissions.

What kinds of DoS submissions are valid?

As noted in the performing your research section, denial of service research is best done on your own instance of GHES. Causing an availability issue is simply not helpful. We are only interested in denial of service issues at the application layer (logic bombs, ReDoS, etc.). Volumetric attack submissions are not eligible for rewards and we may suspend your GitHub account or temporarily ban your IP address.