CVE-2026-21579
Received Received - Intake

Information Disclosure in Confluence Data Center

Publication date: 2026-07-21

Last updated on: 2026-07-21

Assigner: Atlassian

Description
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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-07-21
Last Modified
2026-07-21
Generated
2026-07-21
AI Q&A
2026-07-21
EPSS Evaluated
N/A
NVD
CVE-2026-21579
EUVD
EUVD-2026-46326

Affected Vendors & Products

Showing 12 associated CPEs
Vendor Product Version / Range
atlassian confluence_data_center From 9.2.22 (inc)
atlassian confluence_data_center From 10.2.14 (inc)
atlassian confluence_data_center 7.17
atlassian confluence_data_center 7.19
atlassian confluence_data_center 8.5
atlassian confluence_data_center 8.9
atlassian confluence_data_center 9.0
atlassian confluence_data_center 9.1
atlassian confluence_data_center 9.2
atlassian confluence_data_center 10.0
atlassian confluence_data_center 10.1
atlassian confluence_data_center 10.2

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-UNKNOWN

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This is a High severity Information Disclosure vulnerability affecting specific versions of Confluence Data Center. It allows unauthenticated attackers to view sensitive information due to a flaw introduced in versions 7.17.0 through 10.2.0. The vulnerability has a CVSS score of 8.2, indicating significant risk.

Detection Guidance

The provided CVE data does not include specific detection methods or commands for identifying this vulnerability on a network or system. Atlassian recommends upgrading to fixed versions of Confluence Data Center to address the issue.

Impact Analysis

An unauthenticated attacker could exploit this to access sensitive data stored in vulnerable Confluence Data Center instances. This may include confidential documents, user credentials, or other proprietary information, leading to data breaches or unauthorized access.

Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, violating GDPR and HIPAA compliance requirements. Organizations may face legal penalties, fines, or reputational damage due to data exposure.

Mitigation Strategies

Upgrade to a fixed version of Confluence Data Center. If using version 9.2, upgrade to 9.2.22 or later. If using version 10.2, upgrade to 10.2.14 or later. Download the latest version from Atlassian's download center.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-21579. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart