Threat intelligence dashboard
CVE-2026-21586high

Vulnerability record

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.

Risk score

7.1

CVSS 4.0

Vendor
Atlassian
Product
Confluence Data Center
CWE
CWE-285
Published
Sep 15, 2026
Updated
Sep 16, 2026
CISA KEV
Not flagged

Affected products and versions

Confluence Data Center

Atlassian

Version / rangeStatusType
10.2.1 to 10.2.15affected
10.1.0 to 10.1.2affected
10.0.2 to 10.0.3affected
9.5.1 to 9.5.4affected
9.4.0 to 9.4.1affected
9.3.1 to 9.3.2affected
9.2.0 to 9.2.23affected
9.1.1affected
8.9.7 to 8.9.8affected
8.5.16 to 8.5.31affected
7.19.28 to 7.19.30affected
10.2.17 to 10.2.18unaffected
9.2.24 to 9.2.25unaffected

Technical metrics

7.1

CVSS 4.0

Severity
high
Source
atlassian
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