CVE-2026-56624Network attack vector

Command restriction bypass via unchecked certificate options

Published Jul 20, 2026 · Updated Jul 20, 2026

Improper certificate validation in Apache MINA SSHD servers allows remote authenticated users to bypass certificate command restrictions. Server-side OpenSSH user-certificate validation accepts unsupported force-command and verify-required options without enforcing or rejecting them. A trusted certificate authority must issue the attacker's certificate, and available commands depend on the embedding server implementation.

CVSS severity7.3
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper certificate validation in Apache MINA SSHD servers allows remote authenticated users to bypass certificate command restrictions. Server-side OpenSSH user-certificate validation accepts unsupported force-command and verify-required options without enforcing or rejecting them. A trusted certificate authority must issue the attacker's certificate, and available commands depend on the embedding server implementation.

The record

CVE
CVE-2026-56624
Published
Jul 20, 2026
Updated
Jul 20, 2026
Vendor
The Apache Software Foundation
Product
Apache MINA SSHD
Classifications
CWE-295
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.0.0 <=2.18.0
  2. Affected versionversion=3.0.0-M1 <=3.0.0-M4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Apache Software Foundation · Apache MINA SSHDversion=2.0.0 <=2.18.0; version=3.0.0-M1 <=3.0.0-M4

Published CVSS scores

7.3Apache Software FoundationCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo