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CVE-2026-105134 – OS Command Injection (RCE) – Ahsay AhsayCBS 10.3.0–10.3.2

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Summary

CVE-2026-105134 is a critical, unauthenticated OS command injection vulnerability in Ahsay AhsayCBS, a backup management console used by managed service providers to administer Ahsay backup environments. The flaw resides in the Replication Receiver component and allows a remote attacker to execute arbitrary operating system commands on the underlying server without credentials or user interaction. The issue carries a maximum CVSS v3.1 base score of 10.0 and affects AhsayCBS versions up to 10.3.2.

Technical details

  • Root cause: The /rps/api/json/UpdateReceivers.do endpoint, part of the Replication Receiver component, fails to properly sanitize the random request argument before it is used in a system-level command, enabling injection of arbitrary OS commands.
  • Trigger conditions: An attacker sends a crafted request to the UpdateReceivers.do endpoint with a manipulated random parameter; no authentication, prior session, or user interaction is required.
  • Attack vector: Network — the endpoint is reachable over HTTP(S) on any internet-exposed AhsayCBS instance.
  • Impact: Successful exploitation results in arbitrary command execution on the host operating system, which can lead to full compromise of the backup server, exposure or destruction of backup data, and a foothold for lateral movement across the network.

Affected software

  • Ahsay AhsayCBS 10.3.0
  • Ahsay AhsayCBS 10.3.1
  • Ahsay AhsayCBS 10.3.2
  • Version 10.3.4 is confirmed unaffected (patched)

Severity

  • CVSS v3.1 Base Score: 10.0 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade AhsayCBS to version 10.3.4 or later, where this issue is resolved.
  • If immediate patching is not possible: Restrict network access to the AhsayCBS management interface (including the /rps/api/json/ endpoints) to trusted management networks or VPN only, and monitor for unexpected or anomalous requests to UpdateReceivers.do. Treat any internet-exposed AhsayCBS instance as high risk until patched.

References

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