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CVE-2026-21580NVD
Vulnerability Summary
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.
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.
CVSS v4.0 Base Metrics — Score 8.6 (HIGH)
Attack VectorNetwork
Attack ComplexityLow
Attack RequirementsNone
Privileges RequiredNone
User InteractionNone
Confidentiality (Vulnerable System)High
Integrity (Vulnerable System)High
Availability (Vulnerable System)High
Confidentiality (Subsequent System)None
Integrity (Subsequent System)None
Availability (Subsequent System)None
Affected & Patched Versions
- Atlassian Confluence Data Center >= 10.2.0 to 10.2.11
- Atlassian Confluence Data Center >= 10.1.0 to 10.1.2
- Atlassian Confluence Data Center >= 10.0.2 to 10.0.3
- Atlassian Confluence Data Center >= 9.5.1 to 9.5.4
- Atlassian Confluence Data Center >= 9.4.0 to 9.4.1
- Atlassian Confluence Data Center >= 9.3.1 to 9.3.2
- Atlassian Confluence Data Center >= 9.2.0 to 9.2.20
- Atlassian Confluence Data Center >= 9.1.0 to 9.1.1
- Atlassian Confluence Data Center >= 9.0.3
- Atlassian Confluence Data Center >= 8.9.6 to 8.9.8
- Atlassian Confluence Data Center >= 8.5.15 to 8.5.31
- Atlassian Confluence Data Center >= 7.19.27 to 7.19.30
- Atlassian Confluence Server >= 8.5.15 to 8.5.31
- Atlassian Confluence Server >= 7.19.27 to 7.19.30
Not provided by cveorg for this CVE.