Security

Security Policy

We only support updates to the 3.x versions of Postal.

Version	Supported
3.x.x	✅
< 3.0	❌

If you discover a vulnerability in Postal, please do not post an issue on GitHub. Please, instead, create a new security advisory through GitHub.

HTML injection in mesage view
GHSA-5f4r-5jpr-rfhc published Mar 12, 2026 by adamcooke

High
SMTP Smuggling
GHSA-j42r-6c99-hqf2 published Mar 11, 2024 by adamcooke

Moderate

Learn more about advisories related to postalserver/postal in the GitHub Advisory Database