How broadly exploitable is this vulnerability?

The vulnerability is remotely exploitable wherever the `/cgi-bin/session_login.cgi` endpoint is reachable over the network. If the management interface is exposed to the internet or large internal segments, the exposure surface can be significant.

Does an attacker need valid credentials to exploit this issue?

The description does not guarantee that authentication is required. Exploitability depends on how the login CGI is implemented and deployed; in some configurations, an attacker may exploit the `User` parameter without prior authentication if the parameter is processed before robust credential checks.

What is the safest general fix pattern for developers and vendors?

Refactor the affected CGI logic to avoid constructing shell commands with user input, using non-shell APIs instead. Where interaction with the OS is unavoidable, strictly validate and constrain allowable input, pass arguments via structured, parameterized interfaces, and ensure the web process runs with minimal privileges.

Severity:

CRITICAL RISK

(9.8)

OS Command Injection (CWE-78) in SECCN Dingcheng G10 session_login CGI Handler

CVE-2026-2686

Published:

Feb 18, 2026

Status:

Awaiting Analysis

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

OS Command Injection

CWE:

CWE-77;CWE-78

Impact:

Remote Code Execution

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

Vulnerability Type

Category:

OS Command Injection

CWE:

CWE-77;CWE-78

Impact:

Remote Code Execution

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

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OS Command Injection (CWE-78) in SECCN Dingcheng G10 session_login CGI Handler

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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