RCE in Shopify Tophat
CVE-2026-39862
Tophat is a mobile applications testing harness. Prior to 2.5.1, Tophat is affected by remote code execution via crafted tophat:// or http://localhost:29070 URLs. The arguments query parameter flows unsanitized from URL parsing through to /bin/bash -c execution, allowing an attacker to execute arbitrary commands on a developer's macOS workstation. Any developer with Tophat installed is vulnerable. For previously trusted build hosts, no confirmation dialog appears. Attacker commands run with the user's permissions. This vulnerability is fixed in 2.5.1.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.011 (63.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 63.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.011 · change: +0.005
Affected products
- Shopify Tophat — versions < 2.5.1
Weakness classification (CWE)
References
- github.com/Shopify/tophat/security/advisories/GHSA-8x8g-6rv5-mgg2 (Vendor Advisory)
- github.com/Shopify/tophat/pull/139 (Issue Tracking)
Frequently asked questions
- What is CVE-2026-39862?
- CVE-2026-39862 is a high-severity vulnerability in Shopify Tophat, classified under OS Command Injection. CVSS score: 8.8/10. Published 2026-04-08.
- How severe is CVE-2026-39862?
- High severity. CVSS v3 base score is 8.8 out of 10.