KEV Entry

CVE-2026-21589

Known Exploited Vulnerability Entry CISA

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Entry Details
Confirmed Exploited

CVE-2026-21589

2026-10-15 02:00 CEST

Timestamps

2026-10-15

2026-10-15

Scope

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’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. | 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

References
  • {'id': 'CVE-2026-21589', 'url': 'https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-21589'}

3ec46866-937f-4235-9f06-4f7807b05112

CISA
405284c2-e461-4670-8979-7fd2c9755a60

2026-10-16 06:23 CEST

2026-10-16 06:23 CEST

Evidence
1
Type Source Signal Confidence Details GCVE Metadata
vendor_report cisa-kev successful_exploitation 0.80
View details 
{
  "cwes": [
    "CWE-552"
  ],
  "date_added": "2026-10-15",
  "due_date": "2026-10-18",
  "feed": "CISA Known Exploited Vulnerabilities Catalog",
  "knownRansomwareCampaignUse": "Unknown",
  "product": "Multiple Products",
  "vendorProject": "Atlassian",
  "vulnerabilityName": "Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability"
}
 -
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