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CVE-2026-21589

7.5, high Known exploited

Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
7.5, high high CVSS v3.1
EPSS, next 30 days
13% higher than 96.2% of scored CVEs
Exploitation
Confirmed in the wild
Published
5 Oct 202612 days ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 15 Oct 2026. US federal agencies must remediate by 18 Oct 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.

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.

Details

Vendor
Atlassian
Product
Bamboo Data Center
Weakness
CWE-552 (opens in a new tab)
Status
Analyzed
Updated
15 Oct 2026
Assigner
security@atlassian.com

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References 10

Advisories 9

1 more

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Atlassian CVEs

Every Atlassian CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2023-22527 Atlassian Confluence Data Center and Server Template Injection Vulnerability KEV EPSS 100% 9.8, critical
  • CVE-2023-22518 Atlassian Confluence Data Center and Server Improper Authorization Vulnerability KEV EPSS 100% 9.8, critical
  • CVE-2023-22515 Atlassian Confluence Data Center and Server Broken Access Control Vulnerability KEV EPSS 99% 9.8, critical
  • CVE-2022-36804 Atlassian Bitbucket Server and Data Center Command Injection Vulnerability KEV EPSS 99% 8.8, high
  • CVE-2022-26138 Atlassian Questions For Confluence App Hard-coded Credentials Vulnerability KEV EPSS 98% 9.8, critical
  • CVE-2022-26134 Atlassian Confluence Server and Data Center Remote Code Execution Vulnerability KEV EPSS 100% 9.8, critical
  • CVE-2021-26084 Atlassian Confluence Server and Data Center Object-Graph Navigation Language (OGNL) Injection Vulnerability KEV EPSS 100% 9.8, critical
  • CVE-2021-26086 Atlassian Jira Server and Data Center Path Traversal Vulnerability KEV EPSS 100% 5.3, medium

Beyond this page

Is CVE-2026-21589 in your network?

This page tells you how dangerous CVE-2026-21589 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2026-21589 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2026-21589 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.