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TI-2021-19704 Aliases CVE-2021-43942GHSA-jgc7-95gc-23vp

Cross-site scripting in Atlassian Jira Server

Priority MEDIUM 60CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-79.

Summary

Affected versions of Atlassian Jira Server and Data Center allow remote attackers to inject arbitrary HTML or JavaScript via a Reflected Cross-Site Scripting (XSS) vulnerability in the /rest/collectors/1.0/template/custom endpoint. To exploit this issue, the attacker must trick a user into visiting a malicious website. The affected versions are before version 8.13.15, and from version 8.14.0 before 8.20.3.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.55364 99th percentileScored 2026-11-07
Fix Fixed Jira Server (Atlassian): 8.13.15, 8.20.3Jira Data Center (Atlassian): 8.13.15, 8.20.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
AtlassianJira Serverbefore 8.13.15; 8.14.0 and later; before 8.20.38.13.15, 8.20.3Patch availableCNA
AtlassianJira Data Centerbefore 8.13.15; 8.14.0 and later; before 8.20.38.13.15, 8.20.3Patch availableCNA
  • Jira Server VendorAtlassian Affected before 8.13.15; 8.14.0 and later; before 8.20.3 Fixed in 8.13.15, 8.20.3 Patch available CNA
  • Jira Data Center VendorAtlassian Affected before 8.13.15; 8.14.0 and later; before 8.20.3 Fixed in 8.13.15, 8.20.3 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:atlassian:jira_server:*:*:*:*:*:*:*:*8.14.0 to before 8.20.3VulnerableAtlassian
cpe:2.3:a:atlassian:jira_server_and_data_center:*:*:*:*:*:*:*:*before 8.13.5VulnerableAtlassian
  • cpe:2.3:a:atlassian:jira_server:*:*:*:*:*:*:*:* Versions 8.14.0 to before 8.20.3 Vulnerable ·Atlassian
  • cpe:2.3:a:atlassian:jira_server_and_data_center:*:*:*:*:*:*:*:* Versions before 8.13.5 Vulnerable ·Atlassian

Remediation

  • Fix · CNA Jira Server (Atlassian) Fixed in 8.13.15, 8.20.3
  • Fix · CNA Jira Data Center (Atlassian) Fixed in 8.13.15, 8.20.3

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-43942
  2. 2026-10-03 Alias added: GHSA-jgc7-95gc-23vp

References

Advisory 1

  • TI-2019-08654 Injection in Atlassian Jira Server and Data Center KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-00460 Improper authentication in Atlassian Jira Core Server CVSS 3.1CRITICAL 9.8
  • TI-2024-14399 Code injection in Atlassian Confluence Data Center CVSS 3.1HIGH 8.8
  • TI-2021-08038 Path traversal in Atlassian Jira Server KEVCVSS 3.1MEDIUM 5.3
  • TI-2020-18587 Incorrect authorization in Atlassian Jira Server CVSS 3.1MEDIUM 5.3
  • TI-2019-06067 Server-side request forgery in Atlassian Jira CVSS 3.1MEDIUM 6.5
See all 134 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences