How exploitable is this vulnerability in real applications?

It is highly exploitable in any deployment where untrusted code runs inside SandboxJS and the host or sandbox internals rely on `Map.prototype.has` or related behavior. In such setups, an attacker can reliably escape the sandbox and execute arbitrary code with host privileges.

What level of access does an attacker need?

The attacker must be able to supply or influence the JavaScript executed inside SandboxJS—such as user-provided scripts, configuration-driven logic, or multi-tenant code execution features. No additional host-level permissions are required beyond sandbox code execution rights.

What is the safest general fix pattern?

The safest pattern is to ensure that untrusted code cannot mutate any prototypes or global objects used by the host. In practice, that means not exposing raw built-in prototypes to the sandbox, freezing or wrapping exposed objects, and designing sandbox APIs that provide minimal, hardened interfaces instead of direct access to the host runtime.

Severity:

CRITICAL RISK

(10.0)

Code Injection via Prototype Manipulation (CWE-94) in SandboxJS SAFE_PROTOTYPES

CVE-2026-25587

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:

Code Injection / Sandbox Escape

CWE:

CWE-94

Impact:

Arbitrary Code Execution / Sandbox Escape

Severity:

CRITICAL RISK

(10.0)

CVSS Version:

3.1

Vulnerability Type

Category:

Code Injection / Sandbox Escape

CWE:

CWE-94

Impact:

Arbitrary Code Execution / Sandbox Escape

Severity:

CRITICAL RISK

(10.0)

CVSS Version:

3.1

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Code Injection via Prototype Manipulation (CWE-94) in SandboxJS SAFE_PROTOTYPES

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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