CVE-2025-66406: step-ca Has Improper Authorization Check for SSH Certificate Revocation

December 3, 2025 (updated December 20, 2025)

An authorized attacker can bypass authorization checks and revoke any SSH certificate issued by Step CA by using a valid revocation token.

References

github.com/advisories/GHSA-j7c9-79x7-8hpr
github.com/smallstep/certificates
github.com/smallstep/certificates/security/advisories/GHSA-j7c9-79x7-8hpr
nvd.nist.gov/vuln/detail/CVE-2025-66406

Code Behaviors & Features

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