CVE-2019-20100

Severity: medium (CVSS 4.7 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: yes
Published: 2020-02-12 · updated 2026-06-17
Weakness: CWE-352

Description

The Atlassian Application Links plugin is vulnerable to cross-site request forgery (CSRF). The following versions are affected: all versions prior to 5.4.21, from version 6.0.0 before version 6.0.12, from version 6.1.0 before version 6.1.2, from version 7.0.0 before version 7.0.2, and from version 7.1.0 before version 7.1.3. The vulnerable plugin is used by Atlassian Jira Server and Data Center before version 8.7.0. An attacker could exploit this by tricking an administrative user into making malicious HTTP requests, allowing the attacker to enumerate hosts and open ports on the internal network where Jira server is present.

Affected products

Atlassian Jira: from 7.0.0 before 8.4.5 — fixed in 8.4.5
Atlassian Jira: from 7.0.0 before 8.5.4; from 8.5.5 before 8.6.2 — fixed in 8.5.4, 8.6.2
Atlassian Jira: from 8.5.5 before 8.6.2 — fixed in 8.6.2

How to fix

Upgrade to a fixed version: Atlassian Jira 8.4.5; Atlassian Jira 8.5.4, 8.6.2; Atlassian Jira 8.6.2. Check the vendor advisory for mitigations.

References

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