Remote Code Execution Vulnerability in Tophat by Shopify
CVE-2026-39862

6.3MEDIUM

Key Information:

Vendor

Shopify

Status
Tophat
Vendor
CVE Published:
8 April 2026

What is CVE-2026-39862?

Tophat, a mobile applications testing harness developed by Shopify, has a vulnerability that allows attackers to execute arbitrary commands on a developer's macOS workstation. By utilizing specially crafted URLs (tophat:// or http://localhost:29070), attackers can manipulate the arguments query parameter, which is not properly sanitized, leading to the execution of commands via /bin/bash -c. This poses a significant risk for developers using Tophat, especially on previously trusted build hosts where no confirmation dialog is presented. The vulnerability is addressed in version 2.5.1, which is recommended for all users.

Affected Version(s)

tophat < 2.5.1

References

https://github.com/Shopify/tophat/security/advisories/GHS...
x_refsource_CONFIRM
https://github.com/Shopify/tophat/pull/139
x_refsource_MISC

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.