CVE-2021-39112

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-08-25 · updated 2026-06-17
Weakness: CWE-1022

Description

Affected versions of Atlassian Jira Server and Data Center allow remote attackers to redirect users to a malicious URL via a reverse tabnapping vulnerability in the Project Shortcuts feature. The affected versions are before version 8.5.15, from version 8.6.0 before 8.13.7, from version 8.14.0 before 8.17.1, and from version 8.18.0 before 8.18.1.

Affected products

Atlassian Data Center: before 8.5.15 — fixed in 8.5.15
Atlassian Jira: before 8.5.15 — fixed in 8.5.15
Atlassian Jira: from 8.6.0 before 8.13.7; from 8.14.0 before 8.17.1; from 8.18.0 before 8.18.1 — fixed in 8.13.7, 8.17.1, 8.18.1
Atlassian Jira: from 8.6.0 before 8.13.7; from 8.14.0 before 8.17.1; from 8.18.0 before 8.18.1 — fixed in 8.13.7, 8.17.1, 8.18.1

How to fix

Upgrade to a fixed version: Atlassian Data Center 8.5.15; Atlassian Jira 8.5.15; Atlassian Jira 8.13.7, 8.17.1, 8.18.1; Atlassian Jira 8.13.7, 8.17.1, 8.18.1. Check the vendor advisory for mitigations.

References

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