Our approach to security is designed to protect buyers and sellers. We monitor every transaction, continuously innovate in fraud prevention, and we protect businesses’ data like our business depends on it—because it does. We adhere to industry-leading standards to manage our network, secure our web and client applications, and set policies across our organization.
This program adheres to the Bugcrowd Vulnerability Rating Taxonomy for the prioritization/rating of findings.
We are particularly interested in problems with Square’s payment flows. Confirmed vulnerabilities that directly affect our payments flows will receive a $500 minimum reward.
A Note on Similar Submissions:
We ask that researchers who are able to identify the same or similar types of issues in multiple locations across one of our applications combine those findings into a single submission that includes a description as well as the various locations where vulnerabilities have been identified. This greatly assists us in our triage process and allows us to process your submissions faster. The combined submissions will be evaluated holistically and will receive rewards corresponding to the collective findings. For example, if an application is discovered to have broken access control on a number of API endpoints, please submit a single submission that includes a list of those API endpoints. If separate submissions are made, they may be inadvertently closed as duplicates.
Last updated 02 Jun 2020 19:05:13 UTC
Technical severity | Reward range
p1 Critical | $5,000 - $5,000
p2 Severe | $2,500 - $2,500
p3 Moderate | $900 - $900
p4 Low | $300 - $300
P5 submissions do not receive any rewards for this program.
Target name | Type
*.square.com | Website Testing
*.squareup.com | Other
Square Point of Sale Mobile Application for Android | Android
Square Point of Sale Mobile Application for iOS | iOS
Target name | Type
*.cash.me | Website Testing
Cash App Mobile Application for Android | Android
Any vulnerabilities found in Third-party software | Website Testing
Cash App Mobile Application for iOS | iOS
Any domain/property of Square not listed in the targets section is out of scope. This includes any/all subdomains not listed above.
Squareup.com - Landing page for documentation/resources:
Cash App for iOS : Here
Cash App for Android : Here
Square Point of Sale for iOS : Here
Square Point of Sale for Android : Here
Please sign up for an account using your @bugcrowdninja.com email address. For more info regarding @bugcrowdninja email addresses, see here.
We've created an account with an email address as
flag]@squareup.com. Tell us how you found it, and you'll get a $1000 bounty.
The SHA1 digest of the flag is:
Find a file called BUGCROWD-flag.txt with the contents containing
character flag]. Tell us how you found it, and you'll get a $1000 bounty.
The SHA1 digest of the flag is:
To make sure you know that you have found the right flag, we are publishing
the digests of the flags by running
echo [32 characters] | sha1sum. You can
do the same on your terminal (you might need to install
sha1sum or use an
For example, if the value of the token were
(it's not), then you would get:
~ echo -n fb3f8fe63cc107c1977855c95633fb13 | sha1sum
Some things to keep in mind when hunting for flags:
Square recognizes the important contributions the security research community can make. We encourage coordinated reporting of security issues with our services. We take the security of our services very seriously and monitor their use for indications of a malicious attack. In order to allow us to identify legitimate security research as opposed to malicious attacks against our services, we promise not to bring legal action against researchers who:
We ask that researchers who identify the same or similar types of issues in multiple locations throughout an application combine those findings into a single submission whose description includes the locations where the issues were identified. This greatly assists us in our triage process and allows us to process your submissions faster. The combined submission will be evaluated holistically and will be rewarded corresponding to the collective findings. For example, if an application is discovered to have broken access control on a number of API endpoints, please submit a single submission that includes a list of those API endpoints. If separate submissions are made, they may be inadvertently closed as duplicates.
Please submit any issue related to cryptocurrency to the Square program immediately. Square is eager to work with the community to make sure that every researcher finding related to cryptocurrency will be fairly rewarded given the vulnerability's impact on business and overall severity. This includes compensation that might be higher than what is advertised currently.
If you have data that you feel is particularly sensitive and would like to encrypt before sending it to our bug bounty, please use the following OpenPGP key for encryption:
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This program follows Bugcrowd’s standard disclosure terms.
This program does not offer financial or point-based rewards for P5 — Informational findings. Learn more about Bugcrowd’s VRT.
|Scope Type||Scope Name|
Square Point of Sale Mobile Application for Android
Square Point of Sale Mobile Application for iOS
|Scope Type||Scope Name|
Cash App Mobile Application for Android
Cash App Mobile Application for iOS
Any vulnerabilities found in Third-party software
The public program Square on the platform Bugcrowd has been updated on 2020-04-23, The lowest reward is 300 $.