{"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":"2026-10-15T17:42:00.925867Z"},"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,"slug":"CVE-2026-21589","body":"## Overview\n\nThis 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"hadal","depthScore":96,"depthScoreParts":{"impact":51.2,"likelihood":19.9,"exploitation":25,"ransomware":0},"changes":[{"seq":229940,"id":"CVE-2026-21589","ts":1793120551427,"field":"epss","old":"0.12711","new":"0.99477"},{"seq":227643,"id":"CVE-2026-21589","ts":1792687408850,"field":"epss","old":"0.02777","new":"0.12711"},{"seq":223913,"id":"CVE-2026-21589","ts":1792270157614,"field":"kev","old":"false","new":"true"},{"seq":222627,"id":"CVE-2026-21589","ts":1792088698587,"field":"exploited","old":"false","new":"true"},{"seq":217508,"id":"CVE-2026-21589","ts":1791379972129,"field":"exploit_available","old":"false","new":"true"}]}