External risk intelligence

Ahsay Replication Receiver OS Command Injection

CVE advisorySeverity: CRITICAL (CVSS 9.3)

CVE-2026-105134

The vulnerability exists in a replication receiver API endpoint of a backup server product. Such backup and replication management components are commonly deployed as network-accessible services to facilitate data transfer and administrative management across different sites, making them frequent targets for remote, internet-facing exposure in many enterprise environments.

OS Command Injection

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability has been identified in Ahsay's Replication Receiver component, potentially allowing remote attackers to inject operating system commands. While the specific impact is being assessed, this issue affects a technology used for data replication, which could be a sensitive area for organizations.

Allows remote command injection in replication systems.
Critical flaw in backup and replication software.
Confirm relevance and exposure in your environment.

Attack Path

How an attacker could exploit the issue

An attacker can remotely exploit this vulnerability by sending a specially crafted request to the Replication Receiver's API. This request manipulates an argument in the `UpdateReceivers.do` endpoint, leading to the execution of arbitrary operating system commands.

No authentication or special access needed.
Malicious input to UpdateReceivers.do.
Remote code execution and data compromise.

Live Threat

Current exploitation, exposure, and threat context

A flaw in the Replication Receiver component could allow an attacker to inject operating system commands by manipulating a specific argument in a network-accessible API. This could potentially affect the integrity and availability of the affected system when exploited remotely.

System commands and data integrity.
Remote manipulation of an API argument.
Unrestricted command execution on the system.

Operational Fix

Recommended remediation, mitigation, and detection steps

The Ahsay AhsayCBS product contains a critical OS command injection vulnerability in its Replication Receiver component. This issue is remotely exploitable and the exploit has been published, indicating a high risk of active exploitation. Identifying all instances of Ahsay AhsayCBS, confirming their network exposure and business criticality, and then coordinating with the appropriate teams to plan remediation are the immediate priorities.

Application owners should own the remediation effort.
Verify network exposure and business criticality first.
Plan vendor coordination for an upgrade.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is Ahsay AhsayCBS?

Ahsay AhsayCBS is a centralized backup server software designed to manage and automate data backup and replication across distributed environments. Organizations use it to coordinate data transfers between different sites or offsite storage. The vulnerability specifically resides within the Replication Receiver component, which handles the communication and data ingestion processes required for these backup operations.

What does OS command injection mean for CVE-2026-105134?

This vulnerability, classified as CWE-77/CWE-78, means an attacker can provide specially crafted input that the server mistakenly interprets as a command to be executed by the underlying operating system. Instead of simply processing data, the software allows the attacker's commands to run with the server's privileges. This is a severe weakness because it bypasses normal software controls to grant unauthorized control over the server hardware or filesystem.

How is this vulnerability triggered?

An attacker triggers this flaw by sending a malicious request to the specific API endpoint '/rps/api/json/UpdateReceivers.do' within the Replication Receiver. The attack succeeds by manipulating the 'random' argument in that request. Simply accessing the server or viewing the interface without sending this specific manipulated input to that exact endpoint does not trigger the execution of unauthorized commands.

Do I need to worry if my Ahsay server is internal?

Halo Surface Signal notes that backup and replication services are often deployed to be network-accessible, which frequently makes them internet-facing. While internet-exposed instances are at the highest risk for remote exploitation, any environment running an affected version remains vulnerable to internal threats. You should verify your specific network architecture to see if this management interface can be reached by unauthorized users or segments.

When should I upgrade to resolve this issue?

You should prioritize upgrading to version 10.3.4 immediately. Since this vulnerability allows for remote code execution and documented exploit methods exist, delaying the update increases your risk of compromise. Start by identifying all instances of Ahsay AhsayCBS in your network, confirming which are running versions up to 10.3.2, and coordinating a maintenance window to apply the vendor-provided upgrade.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.