This Critical severity Stored XSS, PrivEsc (Privilege Escalation), and Security Misconfiguration vulnerability was introduced in versions 7.1.1, 7.4.0, 7.13.0, 7.17.0, 7.19.0, 8.0.0, 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 and Server.

This Stored XSS, PrivEsc (Privilege Escalation), and Security Misconfiguration vulnerability, with a CVSS Score of 8.6, allows an unauthenticated attacker to execute arbitrary HTML or JavaScript code on a victims browser, perform actions as a higher-privileged user, and to get into the system utilizing loopholes exposed from security best-practices being overlooked.

Atlassian recommends that Confluence Data Center and Server 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 and Server 9.2: Upgrade to a release greater than or equal to 9.2.21

Confluence Data Center and Server 10.2: Upgrade to a release greater than or equal to 10.2.13

See the release notes ([https://confluence.atlassian.com/doc/confluence-release-notes-327.html]). You can download the latest version of Confluence Data Center and Server from the download center ([https://www.atlassian.com/software/confluence/download-archives]).

This vulnerability was reported via our Bug Bounty program.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00355.

Exploitation none

Automatable yes

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Atlassian Confluence Data Center affected
Version Status Constraints
10.2.0 to 10.2.11 affected —
10.1.0 to 10.1.2 affected —
10.0.2 to 10.0.3 affected —
9.5.1 to 9.5.4 affected —
9.4.0 to 9.4.1 affected —
9.3.1 to 9.3.2 affected —
9.2.0 to 9.2.20 affected —
9.1.0 to 9.1.1 affected —
9.0.3 affected —
8.9.6 to 8.9.8 affected —
8.5.15 to 8.5.31 affected —
7.19.27 to 7.19.30 affected —
10.2.13 to 10.2.15 unaffected —
9.2.21 to 9.2.23 unaffected —
Atlassian Confluence Server affected
Version Status Constraints
8.5.15 to 8.5.31 affected —
7.19.27 to 7.19.30 affected —

No data.

No data.

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Vendors Products
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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://confluence.atlassian.com/pages/viewpage.action?pageId=1821999768 cve-icon cve-icon
https://jira.atlassian.com/browse/CONFSERVER-104381 cve-icon cve-icon
History

Fri, 21 Aug 2026 05:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Wed, 19 Aug 2026 09:00:00 +0000

Type Values Removed Values Added
Title Stored XSS, Privilege Escalation, and Security Misconfiguration in Atlassian Confluence
Weaknesses CWE-269
CWE-710
CWE-79

Tue, 18 Aug 2026 22:15:00 +0000

Type Values Removed Values Added
Description This Critical severity Stored XSS, PrivEsc (Privilege Escalation), and Security Misconfiguration vulnerability was introduced in versions 7.1.1, 7.4.0, 7.13.0, 7.17.0, 7.19.0, 8.0.0, 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 and Server. This Stored XSS, PrivEsc (Privilege Escalation), and Security Misconfiguration vulnerability, with a CVSS Score of 8.6, allows an unauthenticated attacker to execute arbitrary HTML or JavaScript code on a victims browser, perform actions as a higher-privileged user, and to get into the system utilizing loopholes exposed from security best-practices being overlooked. Atlassian recommends that Confluence Data Center and Server 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 and Server 9.2: Upgrade to a release greater than or equal to 9.2.21 Confluence Data Center and Server 10.2: Upgrade to a release greater than or equal to 10.2.13 See the release notes ([https://confluence.atlassian.com/doc/confluence-release-notes-327.html]). You can download the latest version of Confluence Data Center and Server from the download center ([https://www.atlassian.com/software/confluence/download-archives]). This vulnerability was reported via our Bug Bounty program.
First Time appeared Atlassian
Atlassian confluence Data Center
Atlassian confluence Server
CPEs cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:8.5.22:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:8.5.23:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:8.5.24:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:8.5.25:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:8.5.26:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:8.5.27:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:8.5.28:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:8.5.29:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:8.5.30:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:8.5.31:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.0.3:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.10:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.11:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.12:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.13:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.14:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.15:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.16:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.17:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.18:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.19:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.20:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.21:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.22:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.23:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.2:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.3:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.4:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.5:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.6:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.7:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.8:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.2.9:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_data_center:9.4.1:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:*:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:8.5.22:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:8.5.23:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:8.5.24:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:8.5.25:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:8.5.26:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:8.5.27:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:8.5.28:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:8.5.29:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:8.5.30:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:8.5.31:*:*:*:*:*:*:*
Vendors & Products Atlassian
Atlassian confluence Data Center
Atlassian confluence Server
References
Metrics cvssV4_0

{'score': 8.6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: atlassian

Published:

Updated: 2026-08-21T03:55:22.112Z

Reserved: 2026-01-01T00:00:40.721Z

Link: CVE-2026-21580

cve-icon Vulnrichment

Updated: 2026-08-20T15:26:54.524Z

cve-icon NVD

Status : Received

Published: 2026-08-18T22:16:50.140

Modified: 2026-08-21T04:18:02.457

Link: CVE-2026-21580

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-19T11:00:04Z

Weaknesses