Detections
Analytics
CVE-2026-21589
critical
Description
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.
References
https://www.securityweek.com/atlassian-patches-critical-vulnerability-affecting-8-products/
https://www.helpnetsecurity.com/2026/10/06/atlassian-data-center-cve-2026-21589/
https://thehackernews.com/2026/10/critical-atlassian-flaw-lets.html
https://github.com/completetech-security/atlassian-cve-2026-21589-check
https://github.com/CompleTetech-Security/atlassian-cve-2026-21589-check
https://github.com/tonyc973/cvescope
https://github.com/webserverdude/f5_CVE-2026-21589_mitigation
https://github.com/gotr00t0day/CVE-2026-21589
https://github.com/renzi25031469/CVE-2026-21589
https://github.com/rxsklife/CVE-2026-21589
https://github.com/ynsmroztas/AtlasSniper
https://github.com/BimBoxH4/CVE-2026-21589
https://github.com/tc4dy/CVE-2026-21589-PoC-Exploit
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21589
https://jira.atlassian.com/browse/JSDSERVER-16809
https://jira.atlassian.com/browse/JRASERVER-79546
https://jira.atlassian.com/browse/FE-7583
https://jira.atlassian.com/browse/CWD-6610
https://jira.atlassian.com/browse/CRUC-8741
https://jira.atlassian.com/browse/CONFSERVER-104488
https://jira.atlassian.com/browse/BSERV-20604
Details
Published: 2026-10-05
Updated: 2026-10-26
Known Exploited Vulnerability (KEV)
Risk Information
CVSS v2
Base Score: 7.8
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:N
Severity: High
CVSS v3
Base Score: 7.5
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Severity: High
CVSS v4
Base Score: 9.3
Vector: 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
Severity: Critical
EPSS
EPSS: 0.99477
Vulnerability Watch
Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.
Vulnerability of Interest