Critical (10.0). EPSS 9.1% chance of exploitation in the next 30 days. Fixed in github.com/smallstep/certificates 0.29.0.
An attacker can bypass authorization checks and force a Step CA ACME or SCEP provisioner to create certificates without completing certain protocol authorization checks.
Severity
CVSS 3.1
10.0 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
EPSS
9.1% chance of exploitation in the next 30 days; higher than 95% of CVEs (scores of 2026-10-31)