{"uuid": "3ec46866-937f-4235-9f06-4f7807b05112", "vulnerability": {"vulnId": "CVE-2026-21589", "altId": []}, "gcve": {"origin_uuid": "405284c2-e461-4670-8979-7fd2c9755a60", "object_uuid": "3ec46866-937f-4235-9f06-4f7807b05112"}, "status": {"exploited": true, "status_reason": "confirmed", "status_updated_at": "2026-10-15T02:00:00+02:00"}, "timestamps": {"asserted_at": "2026-10-15T00:00:00+00:00", "recorded_at": "2026-10-16T04:23:02+00:00", "first_seen_at": "2026-10-15T00:00:00+00:00"}, "scope": {"notes": "Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability | Affected: Atlassian / Multiple Products | Description: Multiple Atlassian products (Bitbucket Data Center ,Confluence Data Center, Jira Service Management Data Center, Jira Software Data Center, Bamboo Data Center, Crowd Data Center, Crucible and Fisheye) contain a files or directories accessible to external parties vulnerability which could allow an unauthenticated attacker to access specific files within the web application root directory in affected versions. | Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA\u2019s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA\u2019s \u201cForensics Triage Requirements\u201d (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. | Due date: 2026-10-18 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): 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"}, "evidence": [{"type": "vendor_report", "source": "cisa-kev", "signal": "successful_exploitation", "confidence": 0.8, "details": {"cwes": ["CWE-552"], "feed": "CISA Known Exploited Vulnerabilities Catalog", "product": "Multiple Products", "due_date": "2026-10-18", "date_added": "2026-10-15", "vendorProject": "Atlassian", "vulnerabilityName": "Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability", "knownRansomwareCampaignUse": "Unknown"}}], "references": [{"id": "CVE-2026-21589", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-21589"}]}