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CVE-2021-43942

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 for the CVE license. View the record on cve.org

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.

Timeline

  1. ID reserved
  2. Record published
  3. Record last updated

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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.
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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, 19:52 UTC. Sources and licenses