Vulnerability record · CVE-2020-4020 · published 1 June 2020

CVE-2020-4020: Atlassian companion vulnerability

Atlassian · Companion

The file downloading functionality in the Atlassian Companion App before version 1.0.0 allows remote attackers, who control a Confluence Server instance that the Companion App is connected to, execute arbitrary .exe files via a Protection Mechanism Failure.

7.2 CVSS 3.1 High EPSS 1.7% · top 24.2%

7.2CVSS 3.1 base score, v2 6.5

1.7%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

2References

17 Jun 2026Last modified by NVD

Description

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Companion Atlassian

References

Link	Tags
https://jira.atlassian.com/browse/CONFSERVER-59733	Vendor Advisory
https://jira.atlassian.com/browse/CONFSERVER-59733	Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-22524Atlassian companion vulnerabilityCertain versions of the Atlassian Companion App for MacOS were affected by a remote code execution vulnerability. An attacker could utilize WebSocket…EPSS 25%6 Dec 2023 7.8CVE-2020-4019Atlassian companion untrusted search path vulnerabilityThe file editing functionality in the Atlassian Companion App before version 1.0.0 allows local attackers to have the app run a different executable …EPSS 0.35%1 Jun 2020

Source: NIST National Vulnerability Database (record CVE-2020-4020), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.