Is this vulnerability remotely exploitable?

Yes, if an application allows remote users to supply or influence JavaScript that is executed inside SandboxJS, then a remote attacker can often trigger this issue. The sandbox is not a reliable containment boundary in affected versions.

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

The attacker needs the ability to execute code within the SandboxJS environment—such as providing scripts, templates, or plugin logic. No direct access to the host environment is required; once the sandbox is reached, the escape can be performed purely through language features.

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

The safest pattern is to redesign the sandbox boundary so that no raw host objects or constructors are ever exposed to untrusted code. All values crossing into the sandbox should be passed through strict wrappers or facades that remove or neutralize powerful properties and constructors, and the sandbox should enforce a minimal, allowlisted API surface.

Severity:

CRITICAL RISK

(10.0)

Sandbox Escape via Unwrapped Function Return Values (CWE-74) in SandboxJS

CVE-2026-25520

Published:

Feb 6, 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:

Sandbox Escape / Code Injection

CWE:

CWE-74

Impact:

Arbitrary Code Execution Outside the Sandbox

Severity:

CRITICAL RISK

(10.0)

CVSS Version:

3.1

Vulnerability Type

Category:

Sandbox Escape / Code Injection

CWE:

CWE-74

Impact:

Arbitrary Code Execution Outside the Sandbox

Severity:

CRITICAL RISK

(10.0)

CVSS Version:

3.1

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Ask AI for summary of CodeAnt

Sandbox Escape via Unwrapped Function Return Values (CWE-74) in SandboxJS

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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