---
title: "CVE-2021-43942: Atlassian Jira Server vulnerability | CubePath"
description: "Affected versions of Atlassian Jira Server and Data Center allow remote attackers to inject arbitrary HTML or JavaScript via a Reflected Cross-Site…"
language: en
source: https://cubepath.com/security/cve/CVE-2021-43942
---

# CVE-2021-43942: Atlassian Jira Server vulnerability | CubePath

## Description

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.

Official description from the CVE record, published by atlassian. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2021-43942)

## Key data

### EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score

0.55364 (55.4% probability)

Percentile

99.0%

Scores of

Nov 10, 2026

Model

v2026.06.15

### CISA assessment as of Oct 8, 2024

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.

Automatable

no

Technical impact

partial

## Affected products

Products listed in the CVE record, as the CNA published them.

- Atlassian Jira Server

  - affected: unspecified up to before 8.13.15
  - affected: 8.14.0 up to before unspecified
  - affected: unspecified up to before 8.20.3
- Atlassian Jira Data Center

  - affected: unspecified up to before 8.13.15
  - affected: 8.14.0 up to before unspecified
  - affected: unspecified up to before 8.20.3

## References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

- [jira.atlassian.com/browse/JRASERVER-73068](https://jira.atlassian.com/browse/JRASERVER-73068)

## Timeline

1. ID reserved Nov 16, 2021
2. Record published Jan 4, 2022
3. Record last updated Oct 8, 2024

## Look up another CVE

## About CubePath

CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection.

[Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection)

Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 20:05 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)