Vulnerability identifier: #VU51512

Vulnerability risk: Low

CVSSv3.1: 3.3 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-4027

CWE-ID: CWE-94

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Atlassian Confluence Server
Server applications / Web servers

Vendor: Atlassian

Description

The vulnerability allows a remote user to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation. A remote user can bypass velocity template injection mitigations via an injection vulnerability in custom user macros and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Atlassian Confluence Server: 7.5.0, 7.4.0 - 7.4.4

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External links
http://jira.atlassian.com/browse/CONFSERVER-59898

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.