---
id: CVE-2026-21586
title: "This High severity Improper Authorization vulnerability was introduced in versions 7.4.0, 7.13.0, 8.5.0, 8.9.0, 9.0.1, 9.1.0, 9.2.0, 9.3.1, 9.4.0, 9.5.1, 10.0.2, 10.1.0, and 10.2.0 of Confluence Data Center.\r\n\r\nThis Improper Authorizatio…"
summary: "This High severity Improper Authorization vulnerability was introduced in versions 7.4.0, 7.13.0, 8.5.0, 8.9.0, 9.0.1, 9.1.0, 9.2.0, 9.3.1, 9.4.0, 9.5.1, 10.0.2, 10.1.0, and 10.2.0 of Confluence Data Center.\r\n\r\nThis Improper Authorizatio…"
severity: high
cvss: 7.1
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'
cwe:
  - CWE-285
vendor: Atlassian
product: Confluence Data Center
affected:
  - confluence_data_center 10.2.1 to 10.2.15
  - confluence_data_center 10.1.0 to 10.1.2
  - confluence_data_center 10.0.2 to 10.0.3
  - confluence_data_center 9.5.1 to 9.5.4
  - confluence_data_center 9.4.0 to 9.4.1
  - confluence_data_center 9.3.1 to 9.3.2
  - confluence_data_center 9.2.0 to 9.2.23
  - confluence_data_center 9.1.1
  - confluence_data_center 8.9.7 to 8.9.8
  - confluence_data_center 8.5.16 to 8.5.31
  - confluence_data_center 7.19.28 to 7.19.30
published: '2026-09-15'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T12:17:31.453'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-21586'
references:
  - url: 'https://confluence.atlassian.com/pages/viewpage.action?pageId=1822852209'
    label: security@atlassian.com
  - url: 'https://jira.atlassian.com/browse/CONFSERVER-104418'
    label: security@atlassian.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-16T03:56:45.509123Z'
cvssSource: cna
epss: 0.00324
epssPercentile: 0.22744
ingestedAt: '2026-09-15T17:41:02.861Z'
---

## Overview

This High severity Improper Authorization vulnerability was introduced in versions 7.4.0, 7.13.0, 8.5.0, 8.9.0, 9.0.1, 9.1.0, 9.2.0, 9.3.1, 9.4.0, 9.5.1, 10.0.2, 10.1.0, and 10.2.0 of Confluence Data Center.

This Improper Authorization vulnerability, with a CVSS Score of 7.1, allows an authenticated attacker to gain unintended access and can lead to the exposure of resources or functionality, possibly providing attackers with sensitive information or even execute arbitrary code.

Atlassian recommends that Confluence Data Center customers upgrade to latest version, if you are unable to do so, upgrade your instance to one of the specified supported fixed versions:
 Confluence Data Center 9.2: Upgrade to a release greater than or equal to 9.2.24

 Confluence Data Center 10.2: Upgrade to a release greater than or equal to 10.2.17

See the release notes ([https://confluence.atlassian.com/doc/confluence-release-notes-327.html]). You can download the latest version of Confluence Data Center from the download center ([https://www.atlassian.com/software/confluence/download-archives]).

This vulnerability was reported via our Penetration Testing program.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.