- Top reward
- Not published
- Top severity paid
- Not published
- Assets in scope
- 3
- Public CVEs
- 0
- Last change
- No changes yet
At a glance
What to know before you start testing.
- Pays cash
- Amounts are not published; ask before you invest time.
- Report by email
- https://www.activecampaign.com/security/report-an-issue
- Full safe harbor
- Good-faith research is authorised; no legal action.
- Publish after a fix
- Coordinate the timing with the company.
Rewards
What the company's own policy page says it pays.
The policy page has no reward table. Here is what it says, in its own words.
- Pays cash
-
Yes
At our discretion and if our disclosure policy is followed, the reported security issue may be eligible for a cash reward.
- Safe harbor
-
Full
We will not pursue any legal action against you if you obey the rules above.
- Hall of fame
-
Yes
We’re grateful to the following people who have helped us improve the security of Postmark:
Summarised with AI from the company's policy, read 12 Nov 2026, and checked word for word against it. Read the original
Scope
3 assets you may test, 3 excluded.
Domains 2
- account.postmarkapp.com
- postmarkapp.com
APIs 1
- api.postmarkapp.com
Out of scope (3)
- www.activecampaign.com
- any/all subdomains not listed above
- Any domain/property of Postmark not listed in the targets section
Rules
What the policy asks of you, and the bug types it won't reward, quoted from Postmark's policy. "We" in these lines means the program, not this site.
While testing
-
Avoid data deletion, unauthorized data access, and service disruption while testing the vulnerability you found.
-
Do not access or modify, or attempt to access or modify, data that does not belong to you.
-
Do not execute, or attempt to execute, a Denial of Service (DoS) attack.
-
Do not run any automated tools against our servers without prior coordination.
-
Do not try to abuse our servers’ resources, including but not limited to sending unsolicited or unauthorized emails.
-
Do not publicly share the issue details until we confirm that it’s fixed.
-
Do not attempt to blackmail us, or try to sell us your security report.
Not accepted
-
Known vulnerabilities in 3rd party libraries and software used by Postmark (unless you can prove exploitability).
-
Known vulnerabilities in the components of our technological stack were reported within 48 hours of their public reveal.
-
XSS on any domain other than postmarkapp.com
-
SSL/TLS Issues such as: BEAST, BREACH, SSL insecure cipher suites are enabled.
-
Bugs or functionality that proves that a tested email address exists in our database as well as the theoretical ability to brute-force such functionality.
-
Ability to sign up and use our services without confirming an email address.
-
Missing security headers (unless you can prove exploitability)
-
Password brute force (as noted in the exclusions list)
-
Reports for www.activecampaign.com should be reported to ActiveCampaign VDP and are not eligible for reward in this program.
Summarised with AI from the company's policy, read 12 Nov 2026, and checked word for word against it. Read the original
Changes
Tracked since 11 Nov 2026. Last checked 5 hours ago.
No changes yet. When the rewards or scope move, you will see it here and in the RSS feed.
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.