Snapshot of public data from 31 Oct 2026, 12:50:06. This data is not updated until the API is deployed.

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CVE-2026-21589

Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability

UrgentCVSS 9.3 v4.0Exploited

Why this priority

?

Generic watch priority computed by public, versioned rules. It does not know your assets. See the glossary

  • Présent dans le catalogue CISA KEV (exploitation confirmée)

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.

Affected products

VendorProductVersions
AtlassianBamboo Data Center
  • All other versions
AtlassianBitbucket Data Center
  • All other versions
AtlassianConfluence Data Center
  • All other versions
AtlassianCrowd Data Center
  • All other versions
AtlassianCrucible Data Center
  • All other versions
AtlassianFisheye Data Center
  • All other versions
AtlassianJira Service Management Data Center
  • All other versions
AtlassianJira Software Data Center
  • All other versions
AtlassianMultiple ProductsAll versions

Revision history

  1. Revision 3

  2. Revision 2

    Update : Affected versions changed

  3. Revision 1

    New record

Qualification

CVSS severity
?

Technical severity score between 0 and 10, with its version (3.1, 4.0). See the glossary

9.3 CRITICAL CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H
KEV catalog
?

CISA catalog of vulnerabilities with confirmed exploitation. Absence from the catalog does not prove absence of exploitation. See the glossary

Listed
Exploitation
Confirmed
EPSS probability
?

Probability, between 0 and 1, that a vulnerability is exploited in the next 30 days, published daily by FIRST. Always dated. See the glossary

Unknown
Confidence
?

Quality of the sources behind the record. It is not a risk score. See the glossary

High

Priority rules, version 1

CISA KEV catalog

Added on
15 October 2026
Federal due date
18 October 2026
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.
Ransomware use
Unknown

Record

Published on
5 October 2026
Weaknesses (CWE)
CWE-552

Sources

References

CVE-2026-21589 Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability · Avanguard TACTIC