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CVE-2021-26086

MediumPublished

Atlassian Jira Server and Data Center Path Traversal Vulnerability

Published: Aug 16, 2021
Updated: Oct 21, 2025
Assigning CNA: atlassian
Evidence observed: Oct 6, 2021

Primary CVSS

5.3/ 10Medium

nvd · CVSS 3.1

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

EPSS probability estimate

100.0%

High · next 30 days

Percentile: 100.0%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

CISA Known Exploited

This CVE appears in the CISA Known Exploited Vulnerabilities catalog.

Summary

Affected versions of Atlassian Jira Server and Data Center allow remote attackers to read particular files via a path traversal vulnerability in the /WEB-INF/web.xml endpoint. The affected versions are before version 8.5.14, from version 8.6.0 before 8.13.6, and from version 8.14.0 before 8.16.1.

Sources

CVE-2021-26086PoC
Atlassian Jira Server/Data Center 8.4.0 - Arbitrary File read (CVE-2021-26086)
Atlassian Jira Server Data Center 8.16.0 - Arbitrary File ReadExploit
Mayank Deshmukh · multiple · Oct 6, 2021

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