CVE-2026-2063
Published: 06 February 2026
Summary
CVE-2026-2063 is a medium-severity Command Injection (CWE-77) vulnerability in Dlink Dir-823X Firmware. Its CVSS base score is 5.1 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 38.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and AC-6 (Least Privilege).
Deeper analysis
CVE-2026-2063 is an OS command injection vulnerability affecting the D-Link DIR-823X router with firmware version 250416. The flaw resides in unknown code within the /goform/set_ac_server file of the Web Management Interface component, where manipulation of the ac_server argument enables command injection. Published on 2026-02-06, it is rated 4.7 on the CVSS 3.1 scale (AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L) and maps to CWE-77 and CWE-78.
A remote attacker with high privileges can exploit this vulnerability over the network with low complexity and no user interaction required. Successful exploitation allows limited impacts on confidentiality, integrity, and availability, potentially enabling arbitrary OS command execution on the device.
Advisories and further details, including potential mitigation guidance, are available in references such as the GitHub issue at https://github.com/master-abc/cve/issues/19, VulDB entries at https://vuldb.com/?ctiid.344623, https://vuldb.com/?id.344623, and https://vuldb.com/?submit.744720, and the D-Link website at https://www.dlink.com/. An exploit has been publicly released and may be used in attacks.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-5598
Vulnerability details
A security flaw has been discovered in D-Link DIR-823X 250416. This vulnerability affects unknown code of the file /goform/set_ac_server of the component Web Management Interface. The manipulation of the argument ac_server results in os command injection. The attack can be…
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launched remotely. The exploit has been released to the public and may be used for attacks.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
OS command injection in public web management interface directly enables remote exploitation of the exposed application (T1190) and arbitrary Unix shell command execution (T1059.004).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires validation of the ac_server argument in /goform/set_ac_server to block OS command injection payloads.
Limits the scope of accounts permitted to reach the Web Management Interface, reducing the attack surface for the high-privilege injection flaw.
Restricts network access to the router's management interface, blocking remote exploitation of the publicly disclosed command-injection vector.