SEPTEMBER 17, 2026
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Case File

CVE-2026-21586

HIGH · CVSS 7.1 EPSS 0.32%

Source: NVD + CISA KEV + EPSS · Published 2026-09-15 · Last synced 2026-09-17

CyberRota Analysis

AI-Generated

An improper authorization vulnerability in multiple versions of Confluence Data Center allows authenticated attackers to gain unintended access, potentially exposing sensitive information or enabling arbitrary code execution. Organizations using affected versions (7.4.0 through 10.2.0) should prioritize upgrading to the latest version or at least to the specified fixed versions (9.2.24 or 10.2.17) to mitigate the risk. Immediate action is recommended for all Confluence Data Center customers to protect their systems from potential exploitation.

CVE
CVE-2026-21586
Severity
HIGH
CVSS
7.1
EPSS
0.32%

Original NVD 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.