Cyber Resilience

CVE-2025-56425

RCE in Optimal-Systems Enaio 10.10.0.0 – 10.10.0.183

Public PoCRCECommand Injection
Published
08 January 2026
Modified
23 January 2026
Patch / advisory
View advisory
CVSS Score v3.1 9.1
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS Score 0.0065 48th percentile
Risk Priority 68 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2025-56425 is a critical-severity Command Injection (CWE-77) vulnerability in Optimal-Systems Enaio. Its CVSS base score is 9.1 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Command and Scripting Interpreter (T1059); ranked at the 48th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified map to SA-11 (Developer Testing and Evaluation) and SI-10 (Information Input Validation) — see the control section below for these in your framework.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

CVE-2025-56425 is a command injection vulnerability (CWE-77) discovered in the AppConnector component of enaio software. It affects AppConnector version 10.10.0.183 and earlier in enaio 10.10, version 11.0.0.183 and earlier in enaio 11.0, and version 11.10.0.183 and earlier in enaio 11.10. The flaw enables authenticated remote attackers to inject arbitrary SMTP commands by supplying crafted input to the /osrest/api/organization/sendmail endpoint. Published on 2026-01-08, it carries a CVSS v3.1 base score of 9.1 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H).

Authenticated remote attackers can exploit this vulnerability over the network with low attack complexity and no user interaction. By sending malicious payloads to the specified endpoint, they can inject and execute arbitrary SMTP commands, potentially compromising confidentiality and availability to a high degree as indicated by the CVSS metrics.

Advisories and mitigation details are available in references including the analysis at https://mind-bytes.de/smtp-injection-in-enaio-component-appconnector-cve-2025-56425/ and the vendor site at https://www.optimal-systems.de/enaio. Security practitioners should consult these for patching instructions and workarounds specific to affected enaio deployments.

OWASP Top 10 for Web (2025)

A05:2025 Injection

EU & UK References

Vulnerability Data

An issue was discovered in the AppConnector component version 10.10.0.183 and earlier of enaio 10.10, in the AppConnector component version 11.0.0.183 and earlier of enaio 11.0, and in the AppConnctor component version 11.10.0.183 and earlier of enaio 11.10. The vulnerability…

more

allows authenticated remote attackers to inject arbitrary SMTP commands via crafted input to the /osrest/api/organization/sendmail endpoint

CWE(s)
CWE-77

Related Threats

MITRE ATT&CK Enterprise Techniques

T1059 Command and Scripting Interpreter Execution
Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries.
attack.mitre.org →
T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1059.001 PowerShell Execution
Adversaries may abuse PowerShell commands and scripts for execution.
attack.mitre.org →
T1059.003 Windows Command Shell Execution
Adversaries may abuse the Windows command shell for execution.
attack.mitre.org →
T1059.004 Unix Shell Execution
Adversaries may abuse Unix shell commands and scripts for execution.
attack.mitre.org →
T1059.008 Network Device CLI Execution
Adversaries may abuse scripting or built-in command line interpreters (CLI) on network devices to execute malicious command and payloads.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2026-32241Shared CWE-77
CVE-2024-29864Shared CWE-77
CVE-2024-44400Shared CWE-77
CVE-2023-3739Shared CWE-77
CVE-2023-45852Shared CWE-77
CVE-2024-30637Shared CWE-77
CVE-2023-52291Shared CWE-77
CVE-2026-2256Shared CWE-77
CVE-2023-51812Shared CWE-77
CVE-2024-50591Shared CWE-77

Affected Assets

optimal-systems
enaio
10.10.0.0 — 10.10.0.183 · 11.0.0.0 — 11.0.0.183 · 11.10.0.0 — 11.10.0.183

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V1.2.3
  • V1.2.5
  • V1.2.8
  • V1.2.9

Mitigating Controls (NIST 800-53 r5) AI

SA-11 Developer Testing and Evaluation good match

Developer testing and evaluation can discover command-construction flaws before deployment.

SI-10 Information Input Validation good match

Input validation directly stops construction of commands from untrusted data containing special elements.

SA-8 Security and Privacy Engineering Principles partial match

Secure engineering principles include proper neutralization and safe command construction practices.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly require input validation and neutralization that prevent command injection.

DE.CM-09 partial match
prevents

Runtime monitoring of software and data can detect anomalous command execution resulting from injection.

ID.RA-01 partial match
prevents

Identifying recorded vulnerabilities enables remediation of command-injection flaws before exploitation.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.28 Secure coding mostly match
prevents

Secure coding standards require proper escaping and parameterization of commands, directly eliminating CWE-77.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing in development catches command-injection vulnerabilities before release.

A.8.25 Secure development life cycle partial match
prevents

Secure development life cycle mandates input validation and command construction practices that directly prevent command injection.

A.8.26 Application security requirements partial match
prevents

Application security requirements explicitly call for controls against injection flaws including command injection.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles reduce the attack surface but do not prescribe the specific neutralization techniques needed.

References