CVE WatchJul 22, 2026

CVE-2026-49143

BrowserStack Runner through 0.9.5 contains a remote code execution vulnerability in the /_log HTTP handler that allows unauthenticated netwo

CVSS

8.8

High

EPSS

0.4%

p33

KEV

—

Exploit Today

0-100

Published: Jun 2, 2026 · Last modified: Jul 22, 2026 · CWE-94

EPSS · 30d

0.4%EPSS · 30 days0.4%

2026-08-242026-09-21

Technical description

BrowserStack Runner through 0.9.5 contains a remote code execution vulnerability in the /_log HTTP handler that allows unauthenticated network-adjacent attackers to execute arbitrary code by submitting crafted JSON request bodies to the handler, which passes user-supplied data to vm.runInNewContext() combined with eval(). Attackers can escape the Node.js vm sandbox by leveraging a host-context Function reference through util.format to access the host process via this.constructor.constructor, achieving full remote code execution on the underlying system without any authentication.

Official references

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