# CVE-2026-21589: Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability

> CVE-2026-21589: Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability. CVSS 7.5 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2026-21589
Last updated: 2026-10-19T20:31:57Z

- Published: 2026-10-05 21:30 UTC · Updated: 2026-10-19 20:31 UTC · Assigner: atlassian
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS: 99.5%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2026-10-15, federal due date 2026-10-18, ransomware use: Unknown

## 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.

## CISA 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.

## Affected vendors and 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

## Tracked companies

- [Bitbucket](https://rewindex.com/company/bitbucket.md)
- [Confluence](https://rewindex.com/company/confluence.md)
- [Jira](https://rewindex.com/company/jira.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-21589)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-21589)
- [https://jira.atlassian.com/browse/BAM-26567](https://jira.atlassian.com/browse/BAM-26567)
- [https://jira.atlassian.com/browse/BSERV-20604](https://jira.atlassian.com/browse/BSERV-20604)
- [https://jira.atlassian.com/browse/CONFSERVER-104488](https://jira.atlassian.com/browse/CONFSERVER-104488)
- [https://jira.atlassian.com/browse/CRUC-8741](https://jira.atlassian.com/browse/CRUC-8741)
- [https://jira.atlassian.com/browse/CWD-6610](https://jira.atlassian.com/browse/CWD-6610)
- [https://jira.atlassian.com/browse/FE-7583](https://jira.atlassian.com/browse/FE-7583)
- [https://jira.atlassian.com/browse/JRASERVER-79546](https://jira.atlassian.com/browse/JRASERVER-79546)
- [https://jira.atlassian.com/browse/JSDSERVER-16809](https://jira.atlassian.com/browse/JSDSERVER-16809)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-21589 · Markdown: https://rewindex.com/cve/CVE-2026-21589.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-21589 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:11:17.062Z