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CVE-2018-20239

21
FAUCET Score

CVE-2018-20239 is a cross-site scripting (XSS) vulnerability in Atlassian Application Links, affecting various Atlassian products including Confluence, Jira, Crowd, Crucible, and Fisheye. This medium-severity vulnerability (CVSS 5.4) allows remote, authenticated attackers to inject arbitrary HTML or JavaScript via the applinkStartingUrl parameter, requiring user interaction and leading to low impact on confidentiality and integrity. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage for this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 5.0.11CPE matchmatch criteria
cpe:2.3:a:atlassian:application_links:*:*:*:*:*:*:*:*
>= 5.1.0, < 5.2.10CPE matchmatch criteria
cpe:2.3:a:atlassian:application_links:*:*:*:*:*:*:*:*
>= 5.3.0, < 5.3.6CPE matchmatch criteria
cpe:2.3:a:atlassian:application_links:*:*:*:*:*:*:*:*
>= 5.4.0, < 5.4.12CPE matchmatch criteria
cpe:2.3:a:atlassian:application_links:*:*:*:*:*:*:*:*
>= 6.0.0, < 6.0.4CPE matchmatch criteria
cpe:2.3:a:atlassian:application_links:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.4MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.3
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
3.40%
Probability of exploitation in next 30 days
EPSS Percentile
87.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0340 is in the 99th percentile among its peer group of 15,224 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

ecosystem.atlassian.net / browse/APL-1373
Issue TrackingVendor Advisory
jira.atlassian.com / browse/CONFSERVER-58208
Issue TrackingVendor Advisory
jira.atlassian.com / browse/CRUC-8379
Issue TrackingVendor Advisory
jira.atlassian.com / browse/CWD-5362
Issue TrackingVendor Advisory
jira.atlassian.com / browse/FE-7161
Issue TrackingVendor Advisory
jira.atlassian.com / browse/JRASERVER-68855
Issue TrackingVendor Advisory