{ "id": "CVE-2026-21589", "url": "https://spydr.io/cve/CVE-2026-21589", "published": "2026-10-05T22:16:58.423Z", "modified": "2026-10-15T19:40:28.740Z", "score": 9.3, "severity": "critical", "cvss_version": "4.0", "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "score_source": "atlassian.com", "epss": 0.02777, "epss_percentile": 0.86118, "exploited": true, "kev": { "added": "2026-10-15", "due": "2026-10-18", "action": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.", "ransomware": "Unknown", "name": "Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability", "notes": "https://confluence.atlassian.com/security/cve-2026-21589-arbitrary-file-access-vulnerability-impacts-multiple-products-1870495748.html?ref=labs.watchtowr.com ; ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-21589" }, "ssvc_exploitation": "active", "vendors": [ "Atlassian" ], "products": [ "Atlassian Bamboo Data Center", "Atlassian Bitbucket Data Center", "Atlassian Confluence Data Center", "Atlassian Crowd Data Center", "Atlassian Crucible Data Center", "Atlassian Fisheye Data Center", "Atlassian Jira Service Management Data Center", "Atlassian Jira Software Data Center" ], "cwes": [ "CWE-552" ], "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.", "status": "Analyzed", "score_type": "Secondary", "scores": { "cvss_v40": 9.3, "cvss_v31": 7.5, "cvss_v30": null }, "references": [ { "url": "https://jira.atlassian.com/browse/BAM-26567", "tags": [ "Issue Tracking", "Mitigation", "Vendor Advisory" ] }, { "url": "https://jira.atlassian.com/browse/BSERV-20604", "tags": [ "Issue Tracking", "Mitigation", "Vendor Advisory" ] }, { "url": "https://jira.atlassian.com/browse/CONFSERVER-104488", "tags": [ "Issue Tracking", "Mitigation", "Vendor Advisory" ] }, { "url": "https://jira.atlassian.com/browse/CRUC-8741", "tags": [ "Issue Tracking", "Mitigation", "Vendor Advisory" ] }, { "url": "https://jira.atlassian.com/browse/CWD-6610", "tags": [ "Issue Tracking", "Mitigation", "Vendor Advisory" ] }, { "url": "https://jira.atlassian.com/browse/FE-7583", "tags": [ "Issue Tracking", "Mitigation", "Vendor Advisory" ] }, { "url": "https://jira.atlassian.com/browse/JRASERVER-79546", "tags": [ "Issue Tracking", "Mitigation", "Vendor Advisory" ] }, { "url": "https://jira.atlassian.com/browse/JSDSERVER-16809", "tags": [ "Issue Tracking", "Mitigation", "Vendor Advisory" ] }, { "url": "https://github.com/watchtowrlabs/watchTowr-vs-Atlassian-CVE-2026-21589", "tags": [ "Third Party Advisory" ] }, { "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21589", "tags": [ "US Government Resource" ] } ], "nvd_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21589", "covered_in": [], "attribution": [ { "source": "NVD", "url": "https://nvd.nist.gov", "notice": "This product uses data from the NVD API but is not endorsed or certified by the NVD." }, { "source": "CISA KEV", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "notice": "Known exploited vulnerabilities from the CISA KEV catalog." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss", "notice": "Exploit prediction scores from FIRST EPSS." } ] }