CVE-2026-9476
Published: 25 May 2026
Summary
CVE-2026-9476 is a high-severity Command Injection (CWE-77) vulnerability in Totolink A8000RU (inferred from references). Its CVSS base score is 8.9 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 22.8% 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 SI-10 (Information Input Validation) and AC-3 (Access Enforcement).
Deeper analysis
A vulnerability was identified in Totolink A8000RU version 7.1cu.643_b20200521. It affects the setPasswordCfg function in the file /cgi-bin/cstecgi.cgi of the Web Management Interface component, where manipulation of the admpass argument enables OS command injection. The issue is tracked as CVE-2026-9476 with CVSS 8.9 and is associated with CWE-77 and CWE-78.
The attack can be carried out remotely without authentication or user interaction. An attacker supplying crafted input to the affected parameter can execute arbitrary operating system commands on the device. A publicly available exploit exists that may be used to target exposed instances.
The listed references point to a GitHub repository containing a vulnerability description, multiple VulDB entries, and the vendor site, but contain no details on patches, workarounds, or mitigation steps. The EPSS score remains flat at 0.0125 with no material increase after disclosure.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-31709
Vulnerability details
A vulnerability was identified in Totolink A8000RU 7.1cu.643_b20200521. This vulnerability affects the function setPasswordCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Such manipulation of the argument admpass leads to os command injection. The attack can be executed…
more
remotely. The exploit is publicly available and might be used.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Remote OS command injection in web management interface directly enables T1190 exploitation of public-facing application and T1059.004 Unix shell command execution.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires validation and sanitization of the admpass argument in setPasswordCfg to block OS command injection via cstecgi.cgi.
Restricts remote network access to the web management interface, preventing unauthenticated exploitation of the injection flaw from external attackers.
Enforces access-control checks before allowing any modification of password configuration parameters, blocking the unauthenticated command-execution path.