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.

No EPSS score available.

Key SSVC decision points have not yet been added.

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.

No data.

Project Subscriptions

Vendors Products
Atlassian Subscribe
Confluence Data Center Subscribe
Confluence Server Subscribe
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

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: 2026-08-18T22:00:00.396Z

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

Link: CVE-2026-21580

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

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

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

Link: CVE-2026-21580

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses

No weakness.