CVE-2026-24936
Published: 03 February 2026
Summary
CVE-2026-24936 is a critical-severity Improper Input Validation (CWE-20) vulnerability in Asustor Data Master. Its CVSS base score is 9.5 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 48.9% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 AC-3 (Access Enforcement) and IA-8 (Identification and Authentication (Non-organizational Users)).
Deeper analysis
CVE-2026-24936 is an improper input parameters validation vulnerability (CWE-20) in a specific CGI program within ASUSTOR Data Master (ADM). The issue arises when a specific function is enabled while joining an Active Directory (AD) Domain. It affects ADM versions from 4.1.0 through 4.3.3.ROF1, as well as from 5.0.0 through 5.1.1.RCI1. The vulnerability carries a CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), indicating critical severity with high impacts on confidentiality, integrity, and availability.
An unauthenticated remote attacker can exploit this vulnerability over the network with low complexity and no user interaction required. Successful exploitation allows the attacker to write arbitrary data to any file on the system, including overwriting critical system files, which can lead to complete system compromise.
For details on mitigation, patches, or workarounds, refer to the ASUSTOR security advisory at https://www.asustor.com/security/security_advisory_detail?id=51.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-5316
Vulnerability details
When a specific function is enabled while joining a AD Domain from ADM, an improper input parameters validation vulnerability in a specific CGI program allowing an unauthenticated remote attacker to write arbitrary data to any file on the system. By…
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exploiting this vulnerability, attackers can overwrite critical system files, leading to a complete system compromise. Affected products and versions include: from ADM 4.1.0 through ADM 4.3.3.ROF1 as well as from ADM 5.0.0 through ADM 5.1.1.RCI1.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Unauthenticated arbitrary file write in public-facing CGI directly enables T1190 (Exploit Public-Facing Application) for initial access and T1505.003 (Web Shell) via placement of executable server-side code leading to full compromise.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly mandates validation of information inputs at CGI program interfaces, preventing arbitrary data writes due to improper input parameters validation.
Requires identification and authentication for non-organizational users, blocking unauthenticated remote exploitation of the vulnerable CGI program.
Enforces approved access authorizations to system resources, preventing unauthorized file writes enabled by the input validation flaw.