How severe is CVE-2026-39862?

CVE-2026-39862 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-39862 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-39862?

CVE-2026-39862 affects Shopify Tophat. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-39862?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-39862 have an EU (EUVD) identifier?

Yes. CVE-2026-39862 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20613.

When was CVE-2026-39862 published?

CVE-2026-39862 was published on 2026-04-08 and last updated on 2026-06-17.

CVE-2026-39862

CVE-2026-39862 is a high-severity vulnerability in Shopify Tophat with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v4: 6.3
EPSS exploit prediction: 1% (42nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-20613
Weakness: CWE-78
Affected product: Shopify Tophat
Published: 2026-04-08
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-39862?: CVE-2026-39862 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-39862 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-39862?: CVE-2026-39862 affects Shopify Tophat. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-39862?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-39862 have an EU (EUVD) identifier?: Yes. CVE-2026-39862 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20613.
When was CVE-2026-39862 published?: CVE-2026-39862 was published on 2026-04-08 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:shopify:tophat:*:*:*:*:*:*:*:*

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