# CVE-2026-21586: Atlassian Confluence Data Center improper authorization

Source: https://junglewise.ai/threats/cve-2026-21586-atlassian-confluence-data-center-improper-authorization  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-15. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-21586 · Severity: info · CVSS 7.1 · Published 2026-09-15

Confluence Data Center is Atlassian's enterprise document collaboration platform used by organizations to centralize team knowledge and documentation. An authentication bypass vulnerability allows authenticated users to access resources or functionality they should not have permission to view, potentially exposing sensitive documents or enabling unauthorized operations that could compromise data integrity or confidentiality.

Technologies: [Atlassian Confluence Data Center](https://junglewise.ai/threats/technologies/confluence-data-center). Vendors: [Atlassian](https://junglewise.ai/threats/vendors/atlassian).

## Quick answers

**Is CVE-2026-21586 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-21586 being exploited in the wild.

**How severe is CVE-2026-21586?** Informational severity, with a CVSS score of 7.1, published 15 September 2026.

**Which products and versions are affected?** Atlassian Confluence Data Center 7.4.0, 7.13.0, 7.19.0, 8.5.0, 8.9.0-8.9.8, 9.0.1-9.0.2, 9.1.0-9.1.1, 9.2.0-9.2.23, 9.3.1-9.3.2, 9.4.0-9.4.1, 9.5.1-9.5.4, 10.0.2-10.0.3, 10.1.0-10.1.2, 10.2.0-10.2.16.

**Is there a fix for CVE-2026-21586?** A patch was published on 2026-09-15: Fixed versions: 9.2.24, 10.2.17 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-21586 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-21586?** Check whether you run Atlassian Confluence Data Center at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

This is an improper authorization vulnerability (CWE-269) affecting Confluence Data Center across multiple versions starting from 7.4.0 through 10.2.0. An authenticated attacker can exploit insufficient access control checks to gain unintended privileges and access restricted resources or functionality. The vulnerability requires valid credentials to exploit (authenticated attack vector, PR:L) and is reachable over the network without user interaction required. Successful exploitation can lead to exposure of sensitive data. Patches are available: upgrade to Confluence Data Center 9.2.24 or later (9.2.x branch) or 10.2.17 or later (10.2.x branch).

## Affected products

- Atlassian Confluence Data Center 7.4.0, 7.13.0, 7.19.0, 8.5.0, 8.9.0-8.9.8, 9.0.1-9.0.2, 9.1.0-9.1.1, 9.2.0-9.2.23, 9.3.1-9.3.2, 9.4.0-9.4.1, 9.5.1-9.5.4, 10.0.2-10.0.3, 10.1.0-10.1.2, 10.2.0-10.2.16

## Timeline

- 2026-09-15: disclosed
- 2026-09-15: patched: Fixed versions: 9.2.24, 10.2.17

## References

- [https://confluence.atlassian.com/pages/viewpage.action?pageId=1822852209](https://confluence.atlassian.com/pages/viewpage.action?pageId=1822852209)
- [https://jira.atlassian.com/browse/CONFSERVER-104418](https://jira.atlassian.com/browse/CONFSERVER-104418)

## Related threats

- [Atlassian Data Center arbitrary file access without authentication](https://junglewise.ai/threats/cve-2026-21589-h3-summary-this-is-a-vulnerability-in-bitbucket-data-center)
- [Atlassian Confluence Data Center DoS in authenticated request handling](https://junglewise.ai/threats/cve-2026-21588-atlassian-confluence-data-center-dos-in-authenticated-request)
- [Atlassian Confluence Data Center information disclosure](https://junglewise.ai/threats/cve-2026-21579-atlassian-confluence-data-center-information-disclosure)
- [Atlassian Confluence Data Center denial of service](https://junglewise.ai/threats/cve-2026-21577-atlassian-confluence-data-center-denial-of-service)
- [Atlassian Confluence Data Center and Server Template Injection Vulnerability](https://junglewise.ai/threats/cve-2023-22527-atlassian-confluence-data-center-and-server-template-injection)