CVE-2026-105134: Ahsay AhsayCBS Command Injection Vulnerability
Ahsay AhsayCBS contains a command injection vulnerability that could allow a remote attacker to execute operating system commands via manipulation of the random parameter in the Replication Receiver component’s /rps/api/json/UpdateReceivers.do endpoint. This vulnerability can be chained with CVE-2026-105133.
Overview
AhsayCBS, Ahsay's backup server platform, contains a command injection flaw in its Replication Receiver component. The endpoint /rps/api/json/UpdateReceivers.do accepts a random parameter that is passed unsanitized into an OS command, allowing a remote attacker to execute arbitrary operating system commands on the server. Versions prior to 10.3.4 are affected. CISA notes this vulnerability can be chained with CVE-2026-105133, and it is listed in the Known Exploited Vulnerabilities catalog with a published exploit.
Vulnerability details
The flaw is an OS command injection (CWE-78) in the Replication Receiver component of AhsayCBS. The random parameter submitted to /rps/api/json/UpdateReceivers.do is incorporated into a system command without adequate sanitization or escaping. When user-supplied input is incorporated into an OS command without being properly neutralized, an attacker can append or substitute command separators and arbitrary instructions. Because the application trusts the parameter value, the injected commands execute with the same privileges as the AhsayCBS server process. The MECHANISM notes the exact internal execution path is not settled by the available facts.
An attacker sends a crafted HTTP request to the /rps/api/json/UpdateReceivers.do endpoint with a malicious value in the random parameter containing OS command injection payloads. Successful exploitation yields remote command execution on the AhsayCBS host with the privileges of the running server process, giving the attacker full control over that host. CISA notes this vulnerability can be chained with CVE-2026-105133, which may serve as an authentication bypass to reach the endpoint, though the CVSS vector scores no privileges required.
Severity and impact
Exploitation status
This vulnerability is confirmed as actively exploited in the wild — it is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog.
Detection and monitoring
- Monitor web access logs on the AhsayCBS host for POST or GET requests to
/rps/api/json/UpdateReceivers.docontaining shell metacharacters in therandomparameter, such as semicolons, pipe characters, backticks, or$()constructs, which are not expected in legitimate replication receiver calls. - Audit AhsayCBS server logs for requests to the Replication Receiver API from source IPs outside the configured replication peer list, especially where no prior authentication or session establishment is recorded.
Remediation
Additional hardening
- Upgrade AhsayCBS to version 10.3.4 or later, which resolves this injection flaw. Versions 10.3.0, 10.3.1, and 10.3.2 are confirmed affected; consult the vendor release notes listed in References for full details.
- Restrict network access to the AhsayCBS Replication Receiver API endpoint at the firewall or reverse proxy layer, permitting connections only from known, authorized replication peer IP addresses rather than exposing it to the internet or broad internal networks.
- If immediate patching is not possible, consider disabling the Replication Receiver component or blocking access to
/rps/api/json/UpdateReceivers.doat the perimeter until the upgrade can be applied, accepting the loss of replication functionality as a temporary trade-off. - Run the AhsayCBS server process under a least-privilege service account with no interactive shell access and restricted write permissions outside the backup data directory, limiting the impact of any successful command injection.
Key dates
References
- https://www.ahsay.com/en/company/announcements/patch-cve-105133-105134-update
- https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
- https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
- https://nvd.nist.gov/vuln/detail/CVE-2026-105134
- https://vuldb.com/cve/CVE-2026-105134
- https://vuldb.com/submit/942743
- https://vuldb.com/vuln/413351
- https://vuldb.com/vuln/413351/cti
Frequently asked questions
Does CVE-2026-105134 affect my FedRAMP authorization?
If Ahsay AhsayCBS runs inside your authorization boundary, yes. CVE-2026-105134 appears in CISA's Known Exploited Vulnerabilities (KEV) catalog, and its remediation deadline of October 17, 2026 has already passed. An unpatched KEV inside a FedRAMP authorization boundary is an assessor finding; an overdue one is visible to your assessor and your sponsoring agency right now. Your path forward is either to remediate it or to formally document the mitigation and the delay.
How does Knox help me handle CVE-2026-105134?
Knox does not patch your software. Remediating Ahsay AhsayCBS is your responsibility under the FedRAMP shared-responsibility model. What Knox provides is the pre-authorized, single-tenant boundary to remediate within, along with continuous compliance monitoring and audit-artifact coverage to help you document the fix for your next assessment. The remediation work is yours to carry out; managing your compliance posture while you do it is not something you have to handle on your own.
How does Knox's monitoring help with vulnerabilities like this?
Knox's automated continuous monitoring platform watches your environment for newly disclosed vulnerabilities and compliance issues on a continuous basis, including exposures like CVE-2026-105134. That means gaps surface during ongoing monitoring rather than only when an assessor flags them at review time, giving you earlier visibility and more time to act.
How do I get FedRAMP authorized with Knox?
Knox runs a FedRAMP-as-a-Service platform. It gives SaaS vendors a pre-authorized cloud boundary on AWS, Azure, and GCP. Your application inherits 60-80% of the required security controls. You reach FedRAMP authorization in about 90 days for roughly 90% less than the traditional $3.5M path. Book a meeting and Knox will map your path to authorization.
CVE-2026-105134's remediation deadline of October 17, 2026 has passed. What happens now?
If CVE-2026-105134 remains unremediated, it is already a Plan of Action and Milestones (POA&M) item. A growing POA&M list is what turns a routine continuous-monitoring review into a difficult conversation with your agency. Closing the finding out and documenting why the deadline was missed is what keeps your authorization clean and your agency relationship on solid footing.
Access continuous compliance
We never compromise on security. Meet with our team to discuss scope, readiness, and map your company’s accelerated path to government certification.
_Horizontal_RGB.png)
