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Critical9.3Atlassian Updated

Critical [CVE-2026-21580] 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 critical-severity Atlassian advisory covers CVE-2026-21580 affecting Confluence Data Center, Confluence Server.

CVE-2026-21580 Published Aug 18, 2026Updated by vendor Aug 18, 2026
CVE-2026-21580
Affected products & platforms
AtlassianConfluence
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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

See the release notes ([ ]).

This vulnerability was reported via our Bug Bounty program.

Affected products named by the advisory: Confluence Server.

Affected versions
  • Confluence Data Center 10.2.0 to 10.2.11
  • Confluence Data Center 10.1.0 to 10.1.2
  • Confluence Data Center 10.0.2 to 10.0.3
  • Confluence Data Center 9.5.1 to 9.5.4
  • Confluence Data Center 9.4.0 to 9.4.1
  • Confluence Data Center 9.3.1 to 9.3.2
  • Confluence Data Center 9.2.0 to 9.2.20
  • Confluence Data Center 9.1.0 to 9.1.1
  • Confluence Data Center 9.0.3
  • Confluence Data Center 8.9.6 to 8.9.8
  • Confluence Data Center 8.5.15 to 8.5.31
  • Confluence Data Center 7.19.27 to 7.19.30

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Fixed versions
  • 9.2.21
  • 10.2
  • 10.2.13

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • 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]).

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

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