---
id: "CVE-2021-26086"
kind: "vulnerability"
aliases: ["CVE-2021-26086"]
title: "Affected versions of Atlassian Jira Server and Data Center allow remote attackers to read particular files via a\u2026"
severity: "high"
cvss: 5.3
epss: null
exploited: true
status: "open"
category: "vendor"
products: [{"name": "Atlassian Jira Server and Data Center", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "atlassian jira data center", "fixed": ["8.5.14"], "affected": "< 8.5.14", "ecosystem": "vendor"}, {"name": "atlassian jira data center", "fixed": ["8.13.6"], "affected": ">= 8.6.0, < 8.13.6", "ecosystem": "vendor"}, {"name": "atlassian jira data center", "fixed": ["8.16.1"], "affected": ">= 8.14.0, < 8.16.1", "ecosystem": "vendor"}, {"name": "atlassian jira server", "fixed": ["8.5.14"], "affected": "< 8.5.14", "ecosystem": "vendor"}, {"name": "atlassian jira server", "fixed": ["8.13.6"], "affected": ">= 8.6.0, < 8.13.6", "ecosystem": "vendor"}, {"name": "atlassian jira server", "fixed": ["8.16.1"], "affected": ">= 8.14.0, < 8.16.1", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "jira", "jira-data-center", "jira-server", "self-hosted", "vendor"]
not_affected_if: ["atlassian-cloud"]
published_at: "2021-08-16T01:15:06+00:00"
first_seen_at: "2026-10-23T19:11:51+00:00"
updated_at: "2026-10-23T22:29:05+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-26086", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-26086", "first_seen_at": "2026-10-23T22:29:05+00:00"}]
---

# Affected versions of Atlassian Jira Server and Data Center allow remote attackers to read particular files via a…

Atlassian Jira Server and Data Center has a path traversal flaw that lets a remote attacker read files through the /WEB-INF/web.xml endpoint. Attackers are exploiting it in the wild, according to CISA's Known Exploited Vulnerabilities catalog.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Atlassian Jira Server and Data Center affected ? fixed ?
- vendor:atlassian jira data center affected < 8.5.14 fixed 8.5.14
- vendor:atlassian jira data center affected >= 8.6.0, < 8.13.6 fixed 8.13.6
- vendor:atlassian jira data center affected >= 8.14.0, < 8.16.1 fixed 8.16.1
- vendor:atlassian jira server affected < 8.5.14 fixed 8.5.14
- vendor:atlassian jira server affected >= 8.6.0, < 8.13.6 fixed 8.13.6
- vendor:atlassian jira server affected >= 8.14.0, < 8.16.1 fixed 8.16.1

## Fix

Apply the mitigation from Atlassian's vendor advisory for CVE-2021-26086, or stop using the product if no mitigation is available (per CISA required action).

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-26086
- 2026-10-23T22:29:05+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2021-26086

## From the sources

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.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_