Is this vulnerability remotely exploitable over the internet?

Yes, but only by someone who can successfully authenticate as an administrator (or equivalent privileged role) and reach the admin API endpoint. There is no indication that anonymous users can exploit this flaw directly.

What level of access does an attacker need to exploit this issue?

The attacker needs administrator-level credentials or control of an administrative account. With that access, they can submit crafted requests to the theme file management API and abuse the path parameter to write files outside the theme directory.

What is the safest general fix pattern for this kind of issue?

The safest pattern is to strictly resolve and validate all filesystem paths against a pre-defined root directory, rejecting any request that attempts to escape it, and to disallow creation of executable files (like PHP) via web-facing file management features whenever possible.

Severity:

HIGH RISK

(7.2)

Path Traversal Arbitrary File Write (CWE-22) in baserCMS Theme File Management API

CVE-2026-30940

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:

Path Traversal / Arbitrary File Write

CWE:

CWE-22;CWE-73

Impact:

Authenticated Remote Code Execution via Arbitrary File Write

Severity:

HIGH RISK

(7.2)

CVSS Version:

3.1

Vulnerability Type

Category:

Path Traversal / Arbitrary File Write

CWE:

CWE-22;CWE-73

Impact:

Authenticated Remote Code Execution via Arbitrary File Write

Severity:

HIGH RISK

(7.2)

CVSS Version:

3.1

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Ask AI for summary of CodeAnt

Path Traversal Arbitrary File Write (CWE-22) in baserCMS Theme File Management API

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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