CVE-2026-21586 Missing authorization in Confluence Data Center
An authenticated attacker can bypass authorization controls to access sensitive information or execute arbitrary code in Confluence Data Center.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-21586?
CVE-2026-21586 is a high-severity missing authorization vulnerability in Atlassian Confluence Data Center, published on 15 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-285
Which versions are affected by CVE-2026-21586?
How do I fix CVE-2026-21586?
No fix has been published for CVE-2026-21586 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-21586 being exploited?
There is no known exploitation of CVE-2026-21586 in the wild and no public exploit code.
Sources
Also known as GHSA-qjg9-922r-8886.