Description
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.
Published: 2026-09-15
Score: 7.1 High
EPSS: < 1% Very Low
KEV: No
Impact: Unauthorized Access
Action: Immediate Patch
AI Analysis

Impact

This vulnerability is a case of improper authorization, allowing an authenticated user to obtain privileges or access resources beyond what the system intends bypasses the intended permission checks. The likely attack vector is an authenticated attacker using an existing user account; initial system compromise is not required. Successful exploitation can expose sensitive information or, in some contexts, enable arbitrary code execution depending on the elevated privileges granted.

Affected Systems

Atlassian Confluence Data Center is affected. Versions impacted include 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. Atlassian recommends upgrading to the latest release. Specifically, users on Confluence 9.2.24 or later, and users on Confluence 10.2 should upgrade to 10.2.17 or later.

Risk and Exploitability

The CVSS score of 7.1 indicates a medium to high level of risk. Because the attack requires only authenticated access, an attacker with valid user credentials can exploit the flaw without additional privileges. The EPSS score is < 1% and the vulnerability is not listed in the CISA KEV catalog, so there is no evidence of public exploitation yet data or obtain elevated privileges makes the risk significant, especially in environments where Confluence is reachable from untrusted networks.

Generated by OpenCVE AI on September 17, 2026 at 12:50 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Upgrade Confluence Data Center to the latest release or at least to 9.2.24 10.2 advised by Atlassian.
  • Apply the update from the official download center as referenced in Atlassian’s release notes.
  • If an immediate upgrade is not feasible, review and ensuring that least‑privilege policies are enforced and that user accounts have only the permissions they truly require.
  • Implement network segmentation or firewall rules to restrict external access to the Confluence instance until the vulnerability is patched.

Generated by OpenCVE AI on September 17, 2026 at 12:50 UTC.

Tracking

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Advisories

No advisories yet.

History

Thu, 17 Sep 2026 13:15:00 +0000

Type Values Removed Values Added
Title Confluence Data Center Improper Authorization Allows Authenticated Access

Wed, 16 Sep 2026 03:30:00 +0000

Type Values Removed Values Added
Title Confluence Data Center Improper Authorization Allows Authenticated Access

Tue, 15 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-285

Tue, 15 Sep 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 15 Sep 2026 17:15:00 +0000

Type Values Removed Values Added
Description 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.
First Time appeared Atlassian
Atlassian confluence Data Center
CPEs cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:8.5.22:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:8.5.23:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:8.5.24:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:8.5.25:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:8.5.26:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:8.5.27:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:8.5.28:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:8.5.29:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:8.5.30:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:8.5.31:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.1.1:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.10:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.11:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.12:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.13:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.14:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.15:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.16:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.17:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.18:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.19:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.20:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.21:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.22:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.23:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.24:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.25:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.2:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.3:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.4:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.5:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.6:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.7:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.8:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.9:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.4.1:*:*:*:*:*:*:*
Vendors & Products Atlassian
Atlassian confluence Data Center
References
Metrics cvssV4_0

{'score': 7.1, 'vector': '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'}


Subscriptions

Atlassian Confluence Data Center
cve-icon MITRE

Status: PUBLISHED

Assigner: atlassian

Published:

Updated: 2026-09-17T11:58:46.365Z

Reserved: 2026-01-01T00:00:40.722Z

Link: CVE-2026-21586

cve-icon Vulnrichment

Updated: 2026-09-15T17:26:22.700Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-15T17:17:11.580

Modified: 2026-09-17T12:17:31.453

Link: CVE-2026-21586

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-17T13:00:08Z

Weaknesses