Atlassian Jira Server and Data Center Path Traversal Vulnerability
Atlassian — Jira Server
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.
5.3
100.0%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- Published
- Aug 16, 2021
- Modified
- Oct 21, 2025
- Added to KEV
- Nov 12, 2024
- Federal patch due
- Dec 3, 2024
CISA required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Weakness classification
Proof-of-concept & exploitation references
Weaponization
Public repositories whose name or description references CVE-2021-26086, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
No public GitHub repositories referencing CVE-2021-26086 were found at last check. Absence here is not proof no exploit exists - see the references below for vendor advisories and write-ups.
References
Frequently asked questions
What is CVE-2021-26086?
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.
How severe is CVE-2021-26086?
CVE-2021-26086 has a CVSS base score of 5.3 out of 10 (CVSS 3.1).
Is CVE-2021-26086 actively exploited in the wild?
Yes. CVE-2021-26086 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Nov 12, 2024, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2021-26086?
100.0% - meaning FIRST.org's EPSS model estimates a 100.0% probability this vulnerability will be exploited in the wild within 30 days (100% percentile among all scored CVEs).
Is there exploit tooling available for CVE-2021-26086?
Yes - a public Nuclei template referencing CVE-2021-26086 exist in public repositories we checked.
What type of vulnerability is CVE-2021-26086?
CVE-2021-26086 is classified under CWE-22 (CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')).
Cross-checked against
Impactr finds and proves whether CVE-2021-26086 - or flaws like it - are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.
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