Is CVE-2018-13387 actively exploited?

No active exploitation of CVE-2018-13387 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2018-13387 be exploited remotely?

Yes. CVE-2018-13387 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2018-13387?

CVE-2018-13387 has a CVSS score of 6.1 (MEDIUM).

HOME VULNERABILITIESCVE-2018-13387

MEDIUM

CVE-2018-13387

CWE-79Published: July 16, 2018· Updated: Jun 17, 2026

6.1

CVSS v3.1

Official Description

The IncomingMailServers resource in Atlassian JIRA Server before version 7.6.7, from version 7.7.0 before version 7.7.5, from version 7.8.0 before version 7.8.5, from version 7.9.0 before version 7.9.3 and from version 7.10.0 before version 7.10.2 allows remote attackers to inject arbitrary HTML or JavaScript via a cross site scripting (XSS) vulnerability in the messagesThreshold parameter as the fix for CVE-2017-18039 was incomplete.

NVD Source

Technical Analysis

CVE-2018-13387 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.