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Information Disclosure in Atlassian Confluence Data Center
CVE-2026-21579 is a high-severity information disclosure vulnerability in Atlassian Confluence Data Center. The flaw affects multiple release lines and is remotely exploitable over the network without authentication. Successful exploitation allows an unauthenticated attacker to access sensitive information exposed by the application. Publicly available details identify the issue as an information disclosure condition but do not provide specific vulnerable code paths or functions.
What it means and what to do now: patch path, interim mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
Successful exploitation allows an unauthenticated remote attacker to view sensitive information from an affected Confluence Data Center instance. The primary security impact is loss of confidentiality. The available information does not indicate direct integrity or availability impact.
If you can’t patch tonight, do this now.
No specific workaround is described in the available information beyond vendor-recommended upgrading. If immediate patching is not possible, reduce exposure by restricting network access to Confluence Data Center, especially unauthenticated access paths, until fixed versions can be deployed.
Patch, then assume compromise.
Upgrade Atlassian Confluence Data Center to the latest available version. Where staying on a supported branch is necessary, upgrade 9.2 deployments to 9.2.22 or later, and 10.2 deployments to 10.2.14 or later. Affected organizations should apply the vendor-provided fixed releases across impacted release lines as part of normal patch management and validation procedures.
No public exploits tracked yet. Mallory keeps watching.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.