Atlassian Confluence Data Center up to 9.2.21/10.2.13 information disclosure

Summaryinfo

A vulnerability marked as problematic has been reported in Atlassian Confluence Data Center up to 9.2.21/10.2.13. This affects an unknown function. The manipulation leads to information disclosure. This vulnerability is listed as CVE-2026-21579. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in Atlassian Confluence Data Center up to 9.2.21/10.2.13 and classified as problematic. This issue affects an unknown code. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. The summary by CVE is:

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.

The advisory is shared at confluence.atlassian.com. The identification of this vulnerability is CVE-2026-21579 since 01/01/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

Upgrading to version 9.2.22 or 10.2.14 eliminates this vulnerability.

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Productinfo

Vendor

• Atlassian

Name

• Confluence Data Center

Version

• 9.2.0
• 9.2.1
• 9.2.2
• 9.2.3
• 9.2.4
• 9.2.5
• 9.2.6
• 9.2.7
• 9.2.8
• 9.2.9
• 9.2.10
• 9.2.11
• 9.2.12
• 9.2.13
• 9.2.14
• 9.2.15
• 9.2.16
• 9.2.17
• 9.2.18
• 9.2.19
• 9.2.20
• 9.2.21
• 10.2.0
• 10.2.1
• 10.2.2
• 10.2.3
• 10.2.4
• 10.2.5
• 10.2.6
• 10.2.7
• 10.2.8
• 10.2.9
• 10.2.10
• 10.2.11
• 10.2.12
• 10.2.13

License

• free

Website

• Vendor: https://www.atlassian.com/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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