CVE-2019-3396VulnerabilityPublished 11/03/2021Updated 10/24/2026

CVE-2019-3396: Atlassian Confluence Server and Data Center Server-Side Template Injection Vulnerability

Affects Atlassian Confluence Server and Data ServerSource CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 11/03/2021
KEV deadline: 05/03/2022
Ransomware: Used in ransomware campaigns
EPSS: 99.9% chance of exploitation in 30 days – higher than 99% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2019-3396 (opens in a new tab)

Description

CVE-2019-3396 is a server-side template injection vulnerability in Atlassian Confluence Server and Data Center. This flaw allows attackers to perform path traversal and potentially execute remote code on the affected systems. It has been exploited in the wild and is associated with known ransomware campaigns. The vulnerability is rated as high severity due to its impact on system integrity and confidentiality.

Summary

Atlassian Confluence Server and Data Center contain a server-side template injection vulnerability (CVE-2019-3396) that can be exploited by attackers to achieve path traversal and remote code execution. This vulnerability has been actively exploited in the wild and has been linked to ransomware campaigns targeting affected installations. No specific affected versions or patch information is provided in the input data. The vulnerability is classified under CWE-22 (Improper Limitation of a Pathname to a Restricted Directory).

Impact

Successful exploitation can lead to unauthorized access to files outside the intended directories (path traversal) and remote code execution, compromising the affected Confluence Server or Data Center environments. This can result in full system compromise, data theft, or deployment of ransomware.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or official fix information is provided, organizations should monitor Atlassian's advisories for updates and apply any available patches promptly. Until a fix is applied, consider restricting access to Confluence Server and Data Center instances and implementing compensating controls as recommended by the vendor.

Weaknesses

CWE-22Path Traversal (opens in a new tab)

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 09:27:57 UTC

Weaknesses

References

Related threats