CVE-2025-56425 Optimal Systems CVE debrief

Who should care

System administrators and security teams responsible for enaio deployments should assess exposure and prioritize remediation to prevent potential disruption of email services and risk of phishing or spam campaigns. This includes reviewing and updating enaio AppConnector component versions to the latest patched versions, implementing additional security measures to restrict access to the /osrest/api/organization/sendmail endpoint, and monitoring for and

Why it matters

CVE-2025-56425 is a critical vulnerability in the enaio AppConnector component that allows authenticated remote attackers to inject arbitrary SMTP commands. System administrators and security teams should assess exposure and prioritize remediation to prevent potential disruption of email services and risk of phishing or spam campaigns.

• Potential for unauthorized SMTP command injection
• Possible disruption of email services
• Risk of phishing or spam campaigns
• Need for verification of affected versions and remediation status

Technical summary

The vulnerability allows authenticated remote attackers to inject arbitrary SMTP commands via crafted input to the /osrest/api/organization/sendmail endpoint. This issue affects multiple versions of enaio, including 10.10.0.183 and earlier, 11.0.0.183 and earlier, and 11.10.0.183 and earlier. The vulnerability has a CVSS score of 9.1 and is considered critical. System administrators and security teams should assess exposure and prioritize remediation to prevent potential disruption of email services and risk of phishing or spam campaigns.

Defensive priority

High

Recommended defensive actions

• Review and update enaio AppConnector component versions to the latest patched versions
• Implement additional security measures to restrict access to the /osrest/api/organization/sendmail endpoint
• Monitor for suspicious activity and implement incident response plans
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The vulnerability allows authenticated remote attackers to inject arbitrary SMTP commands via crafted input to the /osrest/api/organization/sendmail endpoint. This issue has a CVSS score of 9.1 and is considered critical. The CVE record was published on 2026-01-08T17:15:47.957Z and has not been modified since then. The official CVE Program record and NIST NVD detail page provide additional information.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.