---
id: CVE-2026-21589
title: >-
  This is a vulnerability in Bitbucket Data Center, Confluence Data Center, Jira
  Service Management Data Center, Jira Software Data Center, Bamboo Data Center
summary: >-
  This is a vulnerability in Bitbucket Data Center, Confluence Data Center, Jira
  Service Management Data Center, Jira Software Data Center, Bamboo Data Center.
  Crowd Data Center, Crucible and Fisheye. This Arbitrary File Access
  vulnerabili…
severity: critical
cvss: 9.3
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H'
cwe:
  - CWE-552
vendor: Atlassian
product: Bamboo Data Center
affected:
  - bamboo_data_center All other versions
  - bitbucket_data_center All other versions
  - confluence_data_center All other versions
  - crowd_data_center All other versions
  - crucible_data_center All other versions
  - fisheye_data_center All other versions
  - jira_service_management_data_center All other versions
  - jira_software_data_center All other versions
published: '2026-10-05'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T18:17:26.827'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-21589'
references:
  - url: 'https://jira.atlassian.com/browse/BAM-26567'
    label: security@atlassian.com
  - url: 'https://jira.atlassian.com/browse/BSERV-20604'
    label: security@atlassian.com
  - url: 'https://jira.atlassian.com/browse/CONFSERVER-104488'
    label: security@atlassian.com
  - url: 'https://jira.atlassian.com/browse/CRUC-8741'
    label: security@atlassian.com
  - url: 'https://jira.atlassian.com/browse/CWD-6610'
    label: security@atlassian.com
  - url: 'https://jira.atlassian.com/browse/FE-7583'
    label: security@atlassian.com
  - url: 'https://jira.atlassian.com/browse/JRASERVER-79546'
    label: security@atlassian.com
  - url: 'https://jira.atlassian.com/browse/JSDSERVER-16809'
    label: security@atlassian.com
  - url: 'https://github.com/watchtowrlabs/watchTowr-vs-Atlassian-CVE-2026-21589'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21589
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - in-the-wild
  - exploit-available
  - kev
exploited: true
exploitAvailable: true
ssvc:
  exploitation: active
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T03:56:41.309201Z'
cvssSource: cna
epss: 0.99477
epssPercentile: 0.99943
exploits:
  github: 13
  githubRepos:
    - 'https://github.com/watchtowrlabs/watchTowr-vs-Atlassian-CVE-2026-21589'
    - 'https://github.com/tc4dy/CVE-2026-21589-PoC-Exploit'
    - 'https://github.com/MarcusProgram/CVE-2026-21589'
  nuclei:
    - CVE-2026-21589
  checkedAt: '2026-10-27T17:02:17.773Z'
ingestedAt: '2026-10-05T21:34:25.118Z'
kev: true
kevDateAdded: '2026-10-15'
kevDueDate: '2026-10-18'
kevRansomware: false
---

## Overview

This is a vulnerability in Bitbucket Data Center, Confluence Data Center, Jira Service Management Data Center, Jira Software Data Center, Bamboo Data Center. Crowd Data Center, Crucible and Fisheye. This Arbitrary File Access vulnerability allows an unauthenticated attacker to access specific files within the web application root directory in affected versions. Exploitation requires prior knowledge of the target file's exact name and path; this vulnerability does not allow attackers to enumerate or list directory contents. In some configurations, there may be some sensitive files that make this highly severe. This vulnerability allows an unauthenticated remote attacker to access specific files within the web application root directory in affected versions. The vulnerability must be addressed for affected versions of: -- Bitbucket Data Center, introduced in version >= 4.6.0, fix versions: 9.4.26, 10.2.8, 10.5.1 -- Confluence Data Center, introduced in version >= 5.10.0, fix versions 9.2.26, 10.2.19 -- Crowd Data Center, introduced in version >= 2.11.0, fix versions 6.3.7, 7.0.3, 7.1.7, 7.2.4 -- Jira Software Data Center, introduced in version >= 7.1.0, fix versions 9.12.40, 10.3.26, 11.3.12 -- Jira Service Management Data Center, introduced in version >= 3.1.0, fix versions 5.12.40, 10.3.26, 11.3.12 -- Bamboo Data Center >= 7.0.1, fix versions 10.2.24, 12.1.12 -- Crucible, fix versions 4.9.15 -- Fisheye, fix version 4.9.15 -- Exploitation requires prior knowledge of the target file's exact name and path. The vulnerability does not include the capability to enumerate or list directory contents.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.