--- id: "CVE-2026-105134" kind: "vulnerability" aliases: ["CVE-2026-105134"] title: "ahsay cloud backup suite: A flaw has been found in Ahsay AhsayCBS up to 10.3.2" severity: "critical" cvss: 10.0 epss: null exploited: true status: "resolved" category: "vendor" products: [{"name": "Ahsay AhsayCBS", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "Ahsay AhsayCBS v10", "fixed": ["10.3.4.45"], "affected": "<= 10.3.4.0 (below hotfix 10.3.4.45)", "ecosystem": "vendor"}, {"name": "Ahsay AhsayCBS v7-v9", "fixed": ["9.15.2.70"], "affected": "v7, v8, v9 below hotfix 9.15.2.70 (including 9.15.2.59)", "ecosystem": "vendor"}, {"name": "ahsay cloud backup suite", "fixed": ["10.3.4"], "affected": "< 10.3.4", "ecosystem": "vendor"}] ecosystems: ["vendor"] tags: ["ahsaycbs", "backup-servers", "exploited", "rce", "self-hosted", "vendor", "webshell"] not_affected_if: ["managed-hosting"] published_at: "2026-10-04T07:16:33+00:00" first_seen_at: "2026-10-23T19:11:50+00:00" updated_at: "2026-10-23T23:44:52+00:00" sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-105134", "first_seen_at": "2026-10-23T19:11:50+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-10-23T20:18:46+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-105134", "first_seen_at": "2026-10-23T23:44:52+00:00"}] --- # ahsay cloud backup suite: A flaw has been found in Ahsay AhsayCBS up to 10.3.2 AhsayCBS (self-hosted backup server) has an OS command injection in the Replication Receiver endpoint /rps/api/json/UpdateReceivers.do (random parameter). It is chained with auth bypass CVE-2026-105133 for unauthenticated RCE (SYSTEM on Windows). Exploited since 2026-10-07 (Huntress): JSP webshells, XMRig miner, a MicrosoftEdgeUpdateSvc service for persistence. CISA KEV added it 2026-10-14. Ahsay's first patches (10.3.4.0, 9.15.2.59) did not fully fix it. Hotfixes are partner-portal only. _Summary, check and fix written by a model from the sources; labelled as such._ ## Affected - vendor:Ahsay AhsayCBS affected ? fixed ? - vendor:Ahsay AhsayCBS v10 affected <= 10.3.4.0 (below hotfix 10.3.4.45) fixed 10.3.4.45 - vendor:Ahsay AhsayCBS v7-v9 affected v7, v8, v9 below hotfix 9.15.2.70 (including 9.15.2.59) fixed 9.15.2.70 - vendor:ahsay cloud backup suite affected < 10.3.4 fixed 10.3.4 ## How to check Check the exact AhsayCBS build in the admin console. Exposed if v10 is below hotfix 10.3.4.45 (including 10.3.4.0), or v7/v8/v9 is below hotfix 9.15.2.70 (including 9.15.2.59). Treat the server as compromised if you find any of: unexpected root-of-drive folders (ahsay_ts, ahsay_t8, ahsay_t9, ahsay_t20, ahsay_t21, srv, user, opt); random-named .jsp files or short random folders in %CBS%\webapps; unauthorized RPS receivers; unauthorized admin users; a MicrosoftEdgeUpdateSvc service; child processes of cbssvcX64.exe. ## Fix Apply hotfix v10.3.4.45 (v10) or v9.15.2.70 (v7-v9; v7/v8 must first upgrade to 9.15.0.0), then reboot. Both hotfixes are partner-portal only. Until patched, restrict the management interface to trusted IPs or a VPN. If compromised, Ahsay recommends a full rebuild: reinstall the OS, install 9.15.0.0 or 10.3.4.0 plus the matching hotfix, and restore config from an Auto Save that predates the compromise. ## Timeline - 2026-10-23T19:11:50+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-105134 - 2026-10-23T20:18:46+00:00 analyst — Added v7-v9 product entry (hotfix 9.15.2.70 per Ahsay 12 Oct notice). - 2026-10-23T23:44:52+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-105134 ## Documents - [advisory] Ahsay: Critical Security Alert update CVE-2026-105133/105134 https://www.ahsay.com/en/company/announcements/patch-cve-105133-105134-update - [describes] Huntress: Threat Actors Exploit Critical AhsayCBS Flaws https://www.huntress.com/blog/ahsaycbs-flaws-exploit - [discussion] Rescana: AhsayCBS CVE-2026-105133/105134 analysis https://www.rescana.com/post/ahsaycbs-cve-2026-105133-105134-exploited-backup-console-rce - [fix] Ahsay: AhsayCBS Vulnerability Status Update https://www.ahsay.com/en/company/announcements/ahsaycbs-vulnerability-status-update - [mentions] Horizon3: CVE-2026-105133 & CVE-2026-105134 AhsayCBS https://horizon3.ai/attack-research/vulnerabilities/cve-2026-105133-and-cve-2026-105134/ ## From the sources 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. CISA required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. --- _Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_