- Top reward
- No cash rewards
- Top severity paid
- Critical
- Assets in scope
- 24
- Public CVEs
- 0
- Last change
At a glance
What to know before you start testing.
- No cash rewards
- A disclosure program: you report for credit, not money.
- Report on HackerOne
- Submit through the program page.
- Full safe harbor
- Good-faith research is authorised; no legal action.
- Replies within 2 days
- As the policy promises.
- No public write-ups
- Keep findings private.
Rewards
What HackerOne lists as the payout for each severity.
This program does not pay cash rewards.
- Response
-
Within 2 days
| First Response | 2 days |
- Safe harbor
-
Full
Any activities conducted in a manner consistent with this policy will be considered authorised conduct and we will not initiate legal action against you.
Summarised with AI from the program policy on HackerOne, read 12 Nov 2026, and checked word for word against it. Read the original
Scope
24 assets you may test, 3 excluded.
Wildcard domains 14
- *.itesco.cz/* Critical No bounty
- *.itesco.sk/* Critical No bounty
- *.ourtesco.com/* Critical No bounty
- *.tescocloud.com/* Critical No bounty
- *.tesco.com/* Critical No bounty
- *.tesco-europe.com/* Critical No bounty
- *.tesco.hu/* Critical No bounty
- *.tesco.ie/* Critical No bounty
- *.tesco.org/* Critical No bounty
- *.tescoplc.com/* Critical No bounty
- *.tesco.sk/* Critical No bounty
- www.booker.co.uk/* Critical No bounty
- www.onestop.co.uk/* Critical No bounty
- www.tescomobile.com/* Critical No bounty
iOS apps 2
- 389581236 Critical No bounty
- 857834425 Informational No bounty
Android apps 1
- com.tesco.grocery.view Critical No bounty
Products and areas 7
- API Assets Critical No bounty
- Cloud Assets Critical No bounty
- Domain, Subdomain & Zone Takeovers Medium No bounty
- Exposed Sensitive Documents Critical No bounty
- Leaked & Default Credentials Critical No bounty
- Medium, High and Critical Severity Issue on Out-Of-Scope Assets Critical No bounty
- Third-Party Managed Assets Critical No bounty
Out of scope (3)
- com.tescobank.mobile
- Dunnhumby (Non-Critical)
- Tesco Bank
Rules
What the policy asks of you, and the bug types it won't reward, quoted from Tesco (via HackerOne)'s policy. "We" in these lines means the program, not this site.
While testing
-
Please provide detailed reports with reproducible steps. If the report is not detailed enough to reproduce the issue, the issue may not be marked as triaged.
-
Submit one vulnerability per report, unless you need to chain vulnerabilities to provide impact.
-
When duplicates occur, we only triage the first report that was received (provided that it can be fully reproduced).
-
Multiple vulnerabilities caused by one underlying issue will be treated as one valid report.
-
Social engineering (e.g. phishing, vishing, smishing) is prohibited.
-
Make a good faith effort to avoid privacy violations, destruction of data, and interruption or degradation of our service. Only interact with accounts you own or with explicit permission of the account holder.
-
Where possible, use the custom HTTP header:
Not accepted
-
Clickjacking on pages with no sensitive actions
-
Cross-Site Request Forgery (CSRF) on unauthenticated forms or forms with no sensitive actions
-
Attacks requiring MITM or physical access to a user's device.
-
Previously known vulnerable libraries without a working Proof of Concept.
-
Comma Separated Values (CSV) injection without demonstrating a vulnerability.
-
Missing best practices in SSL/TLS configuration.
-
Any activity that could lead to the disruption of our service (DoS).
-
Content spoofing and text injection issues without showing an attack vector/without being able to modify HTML/CSS
-
Rate limiting or bruteforce issues on non-authentication endpoints
-
Missing best practices in Content Security Policy.
-
Missing HttpOnly or Secure flags on cookies
-
Missing email best practices (Invalid, incomplete or missing SPF/DKIM/DMARC records, etc.)
-
Vulnerabilities only affecting users of outdated or unpatched browsers [Less than 2 stable versions behind the latest released stable version]
-
Software version disclosure / Banner identification issues / Descriptive error messages or headers (e.g. stack traces, application or server errors).
-
Tabnabbing
-
Open redirect - unless an additional security impact can be demonstrated
-
Issues that require unlikely user interaction
Summarised with AI from the program policy on HackerOne, read 12 Nov 2026, and checked word for word against it. Read the original
Changes
Tracked since 11 Nov 2026. Last checked 17 minutes ago.
No changes yet. When the rewards or scope move, you will see it here and in the RSS feed.
Before we tracked it
Scope and reward changes recorded before this page started tracking it.
-
Scope added
https://www.tescomobile.com/*
-
Scope added
*.tescoplc.com/*
-
Scope added
https://www.onestop.co.uk/*
-
Scope added
*.itesco.cz/*
-
Scope added
*.itesco.sk/*
-
Scope added
*.ourtesco.com/*
-
Scope added
*.tesco-europe.com/*
-
Scope added
*.tesco.com/*
-
Scope added
*.tesco.hu/*
-
Scope added
*.tesco.ie/*
-
Scope added
*.tesco.org/*
-
Scope added
*.tesco.sk/*
-
Scope added
*.tescocloud.com/*
-
Scope added
https://www.booker.co.uk/*
Public CVEs
Published vulnerabilities in this vendor's products, from the NVD.
No CVEs matched yet. We match NVD records by vendor name, so products sold under another name can be missing.
Original policy
Copied from hackerone.com on 12 Nov 2026. The summaries on this page are made from it; the live page may have changed since.
Tesco looks forward to working with the security community to find vulnerabilities in order to keep our businesses and customers safe.
Response Targets
Tesco will make a best effort to meet the following SLAs for hackers participating in our program:
| Type of Response | SLA in business days |
|---|---|
| First Response | 2 days |
| Time to Triage | 2 days |
| Time to Resolution | depends on severity and complexity |
We’ll try to keep you informed about our progress throughout the process.
Disclosure Policy
- Please do not discuss any vulnerabilities (even resolved ones) outside of the program without express consent from the organisation.
- Follow HackerOne's disclosure guidelines.
Program Rules
- Please provide detailed reports with reproducible steps. If the report is not detailed enough to reproduce the issue, the issue may not be marked as triaged.
- Submit one vulnerability per report, unless you need to chain vulnerabilities to provide impact.
- When duplicates occur, we only triage the first report that was received (provided that it can be fully reproduced).
- Multiple vulnerabilities caused by one underlying issue will be treated as one valid report.
- Social engineering (e.g. phishing, vishing, smishing) is prohibited.
- Make a good faith effort to avoid privacy violations, destruction of data, and interruption or degradation of our service. Only interact with accounts you own or with explicit permission of the account holder.
- Where possible, use the custom HTTP header:
Mozilla/5.0 (IE 11.0; Windows NT 6.3; WOW64; Trident/7.0; Touch; rv:11.0) like Gecko TescoHackerOneTesting
Out of scope vulnerabilities
When reporting vulnerabilities, please consider (1) attack scenario / exploitability, and (2) security impact of the bug. The following issues are considered out of scope:
- Clickjacking on pages with no sensitive actions
- Cross-Site Request Forgery (CSRF) on unauthenticated forms or forms with no sensitive actions
- Attacks requiring MITM or physical access to a user's device.
- Previously known vulnerable libraries without a working Proof of Concept.
- Comma Separated Values (CSV) injection without demonstrating a vulnerability.
- Missing best practices in SSL/TLS configuration.
- Any activity that could lead to the disruption of our service (DoS).
- Content spoofing and text injection issues without showing an attack vector/without being able to modify HTML/CSS
- Rate limiting or bruteforce issues on non-authentication endpoints
- Missing best practices in Content Security Policy.
- Missing HttpOnly or Secure flags on cookies
- Missing email best practices (Invalid, incomplete or missing SPF/DKIM/DMARC records, etc.)
- Vulnerabilities only affecting users of outdated or unpatched browsers [Less than 2 stable versions behind the latest released stable version]
- Software version disclosure / Banner identification issues / Descriptive error messages or headers (e.g. stack traces, application or server errors).
- Tabnabbing
- Open redirect - unless an additional security impact can be demonstrated
- Issues that require unlikely user interaction
Safe Harbor
Any activities conducted in a manner consistent with this policy will be considered authorised conduct and we will not initiate legal action against you. If legal action is initiated by a third party against you in connection with activities conducted under this policy, we will take steps to make it known that your actions were conducted in compliance with this policy.
Thank you for helping keep Tesco and our users safe!