Is this vulnerability remotely exploitable over the internet?

Yes, but only through the administrative interface. An attacker must reach the baserCMS admin panel and successfully authenticate (or compromise an existing admin session) to trigger the vulnerable update functionality.

What level of access is required to exploit this issue?

Exploitation requires administrator-level access within baserCMS. That access might be obtained legitimately, via stolen credentials, session hijacking, or chained with other vulnerabilities affecting authentication or session management.

What is the safest general fix pattern for this type of vulnerability?

The most robust fix is to remove shell command construction from the code path and instead rely on APIs that execute specific operations without invoking a shell, combined with strict whitelisting of any dynamic parameters. Where command execution is unavoidable, arguments should be passed as structured arrays and thoroughly validated.

Severity:

CRITICAL RISK

(9.1)

OS Command Injection (CWE-78) in baserCMS Core Update Functionality

CVE-2026-21861

Published:

Mar 30, 2026

Status:

Analyzed

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-78

Impact:

Remote Code Execution

Severity:

CRITICAL RISK

(9.1)

CVSS Version:

3.1

Vulnerability Type

Category:

OS Command Injection

CWE:

CWE-78

Impact:

Remote Code Execution

Severity:

CRITICAL RISK

(9.1)

CVSS Version:

3.1

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OS Command Injection (CWE-78) in baserCMS Core Update Functionality

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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