HOMEVULNERABILITIESCVE-2018-20239
MEDIUM

CVE-2018-20239

CWE-79Published: April 30, 2019· Updated: Jun 17, 2026

5.4
CVSS v3.1

Official Description

Application Links before version 5.0.11, from version 5.1.0 before 5.2.10, from version 5.3.0 before 5.3.6, from version 5.4.0 before 5.4.12, and from version 6.0.0 before 6.0.4 allows remote attackers to inject arbitrary HTML or JavaScript via a cross site scripting (XSS) vulnerability in the applinkStartingUrl parameter. The product is used as a plugin in various Atlassian products where the following are affected: Confluence before version 6.15.2, Crucible before version 4.7.0, Crowd before version 3.4.3, Fisheye before version 4.7.0, Jira before version 7.13.3 and 8.x before 8.1.0.

NVD Source

Technical Analysis

CVE-2018-20239 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

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.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionRequired
ScopeChanged
Impact
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected Vendors & Products

Atlassian8 product(s)
application linksconfluence data centerconfluence servercrowdcruciblefisheyejira data centerjira server
Source: NVD CPE · 8 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
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Official Patches & Advisories

All References (12)

https://ecosystem.atlassian.net/browse/APL-1373Issue Tracking · Vendor Advisory
https://jira.atlassian.com/browse/CRUC-8379Issue Tracking · Vendor Advisory
https://jira.atlassian.com/browse/CWD-5362Issue Tracking · Vendor Advisory
https://jira.atlassian.com/browse/FE-7161Issue Tracking · Vendor Advisory
https://jira.atlassian.com/browse/JRASERVER-68855Issue Tracking · Vendor Advisory
https://ecosystem.atlassian.net/browse/APL-1373Issue Tracking · Vendor Advisory
https://jira.atlassian.com/browse/CRUC-8379Issue Tracking · Vendor Advisory
https://jira.atlassian.com/browse/CWD-5362Issue Tracking · Vendor Advisory
https://jira.atlassian.com/browse/FE-7161Issue Tracking · Vendor Advisory
https://jira.atlassian.com/browse/JRASERVER-68855Issue Tracking · Vendor Advisory

Quick Facts

CVE IDCVE-2018-20239
CVSS Score5.4 / 10
SeverityMEDIUM
WeaknessCWE-79
CISA KEVNo
Affected1 vendor(s)
PublishedApr 30, 2019

Related CVEs (CWE-79)

Recommended Actions

  • Apply vendor patches immediately
  • Monitor CVE-2018-20239 in threat intel feeds
  • Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.