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CVE-2026-21589

CRITICAL · CVSS 9.3 · Analyzed

Published: 2026-10-05 · Updated: 2026-10-26 · Source: NVD

Vulnerability overview

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.

Severity and scoring

CVSS score
9.3 · CRITICAL
CVSS version
4.0
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weaknesses
CWE-552

CVSS measures technical severity; it does not establish whether this vulnerability is being exploited in your environment.

Known exploitation and remediation

Listed in CISA’s Known Exploited Vulnerabilities catalog.

Affected product
Atlassian · Multiple Products
Added to catalog
2026-10-15
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.
CISA remediation due date
2026-10-18

CISA deadlines apply to the organizations covered by its directives. Confirm your own remediation requirements.

Verify affected versions and patch availability in the vendor advisory before making changes.

Affected products and versions

  • cpe:2.3:a:atlassian:bitbucket_data_center:*:*:*:*:*:*:*:*

    From (inclusive): 7.17.0

    Before (exclusive): 9.4.26

  • cpe:2.3:a:atlassian:bitbucket_data_center:*:*:*:*:*:*:*:*

    From (inclusive): 9.5.0

    Before (exclusive): 10.2.8

  • cpe:2.3:a:atlassian:bitbucket_data_center:*:*:*:*:*:*:*:*

    From (inclusive): 10.3.0

    Before (exclusive): 10.5.1

  • cpe:2.3:a:atlassian:bitbucket_server:*:*:*:*:*:*:*:*

    From (inclusive): 4.6.0

    Through (inclusive): 8.14.6

  • cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*

    From (inclusive): 5.10.0

    Before (exclusive): 9.2.26

  • cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*

    From (inclusive): 9.3.0

    Before (exclusive): 10.2.19

  • cpe:2.3:a:atlassian:crowd:*:*:*:*:*:*:*:*

    From (inclusive): 2.11.0

    Before (exclusive): 6.3.7

  • cpe:2.3:a:atlassian:crowd:*:*:*:*:*:*:*:*

    From (inclusive): 7.0.0

    Before (exclusive): 7.0.3

  • cpe:2.3:a:atlassian:crowd:*:*:*:*:*:*:*:*

    From (inclusive): 7.1.0

    Before (exclusive): 7.1.7

  • cpe:2.3:a:atlassian:crowd:*:*:*:*:*:*:*:*

    From (inclusive): 7.2.0

    Before (exclusive): 7.2.4

  • cpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:*

    From (inclusive): 7.1.0

    Before (exclusive): 9.12.40

  • cpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:*

    From (inclusive): 9.13.0

    Before (exclusive): 10.3.26

  • cpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:*

    From (inclusive): 10.4.0

    Before (exclusive): 11.3.12

  • cpe:2.3:a:atlassian:jira_service_desk:*:*:*:*:data_center:*:*:*

    From (inclusive): 3.1.0

    Through (inclusive): 4.13.27

  • cpe:2.3:a:atlassian:jira_service_management:*:*:*:*:data_center:*:*:*

    From (inclusive): 4.14.0

    Before (exclusive): 5.12.40

  • cpe:2.3:a:atlassian:jira_service_management:*:*:*:*:data_center:*:*:*

    From (inclusive): 5.13.0

    Before (exclusive): 10.3.26

  • cpe:2.3:a:atlassian:jira_service_management:*:*:*:*:data_center:*:*:*

    From (inclusive): 10.4.0

    Before (exclusive): 11.3.12

  • cpe:2.3:a:atlassian:bamboo:*:*:*:*:*:*:*:*

    From (inclusive): 7.0.1

    Before (exclusive): 10.2.24

  • cpe:2.3:a:atlassian:bamboo:*:*:*:*:*:*:*:*

    From (inclusive): 11.0.0

    Before (exclusive): 12.1.12

  • cpe:2.3:a:atlassian:crucible:*:*:*:*:*:*:*:*

    Before (exclusive): 4.9.15

  • cpe:2.3:a:atlassian:fisheye:*:*:*:*:*:*:*:*

    Before (exclusive): 4.9.15

These are NVD CPE applicability entries. Some products depend on configuration conditions; consult the official record to confirm applicability.

Advisories and references

Explore official sources

Read the official NVD record ↗

Explore the CISA catalog ↗

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