Skip to content
VulniPulse
Sign in
Advisory severityCritical9.3Atlassian 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.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-21580 Source published Source updated

VulniPulse record published Record updated

CVE-2026-21580
Affected products & platforms
AtlassianConfluence
Open source advisory

Android app · Google Play

Monitor future Atlassian CVEs from your phone.

Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 34 official vendor sources and 160+ reviewed platform categories.

Matching phone alertsOptional email delivery
Get CVE alertsSee app features

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 months ago·verify at source

Fixed versions
  • 9.2.21
  • 10.2
  • 10.2.13

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

Discussion(0)

No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.

Sign in to join the discussion.