CVE-2026-21579: Infoleak
This High severity Information Disclosure vulnerability was introduced in versions 7.17.0, 7.19.0, 8.5.0, 8.9.0, 9.0.1, 9.1.0, 9.2.0, 10.0.2, 10.1.0, and 10.2.0 of Confluence Data Center. This Information Disclosure vulnerability, with a CVSS Score of 8.2, allows an unauthenticated attacker to view sensitive information via an Information Disclosure vulnerability. 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 9.2.22 Confluence Data Center 10.2: Upgrade to a release greater than or equal to 10.2.14 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 Atlassian (Internal) program.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Atlassian Confluence Data Centerto a version that resolves this vulnerability.Fixed in 10.2.14 - Upgrade
Upgrade
Atlassian Confluence Data Centerto a version that resolves this vulnerability.Fixed in 9.2.22
Event History
Frequently Asked Questions
What is the severity of CVE-2026-21579?
CVE-2026-21579 has a high severity rating with a CVSS score of 8.2.
How do I fix CVE-2026-21579?
To fix CVE-2026-21579, you should upgrade to the latest version of Confluence Data Center that is not affected by this vulnerability.
Who is affected by CVE-2026-21579?
CVE-2026-21579 affects users of Atlassian Confluence Data Center versions 7.17.0, 7.19.0, 8.5.0, 8.9.0, and 9.0.1 through 10.2.0.
What type of vulnerability is CVE-2026-21579?
CVE-2026-21579 is an Information Disclosure vulnerability that allows unauthenticated attackers to view sensitive information.
When was CVE-2026-21579 published?
CVE-2026-21579 was published on July 21, 2026.