Is CVE-2026-25587 actively exploited?

No active exploitation of CVE-2026-25587 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-25587 be exploited remotely?

Yes. CVE-2026-25587 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-25587?

CVE-2026-25587 has a CVSS score of 10.0 (CRITICAL).

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CRITICAL

CVE-2026-25587

CWE-94Published: February 6, 2026· Updated: Jun 17, 2026

10.0

CVSS v3.1

Official Description

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, as Map is in SAFE_PROTOYPES, it's prototype can be obtained via Map.prototype. By overwriting Map.prototype.has the sandbox can be escaped. This vulnerability is fixed in 0.8.29.

NVD Source

Risk Analysis

This vulnerability in the SandboxJS library allows an attacker to escape the sandbox environment by manipulating the Map.prototype.has function. Given the critical CVSS score of 10.0, this flaw poses a severe risk of full system compromise if exploited.

There is no known public exploit for this vulnerability, though it is remotely exploitable due to the network-accessible vector.

Recommended Action

Update the SandboxJS library to version 0.8.29 or later to resolve the issue.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2026-25587 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 10.0.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.