CVE-2024-21678

This High severity Stored XSS vulnerability was introduced in version 2.7.0 of Confluence Data Center. This Stored XSS vulnerability, with a CVSS Score of 8.5, allows an authenticated attacker to execute arbitrary HTML or JavaScript code on a victims browser which has high impact to confidentiality, low impact to integrity, no impact to availability, and requires no user interaction. Data Center Atlassian recommends that Confluence Data Center customers upgrade to the latest version. If you are unable to do so, upgrade your instance to one of the specified supported fixed versions: ||Affected versions||Fixed versions|| |from 8.7.0 to 8.7.1|8.8.0 recommended or 8.7.2| |from 8.6.0 to 8.6.1|8.8.0 recommended| |from 8.5.0 to 8.5.4 LTS|8.8.0 recommended or 8.5.5 LTS or 8.5.6 LTS| |from 8.4.0 to 8.4.5|8.8.0 recommended or 8.5.6 LTS| |from 8.3.0 to 8.3.4|8.8.0 recommended or 8.5.6 LTS| |from 8.2.0 to 8.2.3|8.8.0 recommended or 8.5.6 LTS| |from 8.1.0 to 8.1.4|8.8.0 recommended or 8.5.6 LTS| |from 8.0.0 to 8.0.4|8.8.0 recommended or 8.5.6 LTS| |from 7.20.0 to 7.20.3|8.8.0 recommended or 8.5.6 LTS| |from 7.19.0 to 7.19.17 LTS|8.8.0 recommended or 8.5.6 LTS or 7.19.18 LTS or 7.19.19 LTS| |from 7.18.0 to 7.18.3|8.8.0 recommended or 8.5.6 LTS or 7.19.19 LTS| |from 7.17.0 to 7.17.5|8.8.0 recommended or 8.5.6 LTS or 7.19.19 LTS| |Any earlier versions|8.8.0 recommended or 8.5.6 LTS or 7.19.19 LTS| Server Atlassian recommends that Confluence Server customers upgrade to the latest 8.5.x LTS version. If you are unable to do so, upgrade your instance to one of the specified supported fixed versions:   ||Affected versions||Fixed versions|| |from 8.5.0 to 8.5.4 LTS|8.5.5 LTS or 8.5.6 LTS recommended | |from 8.4.0 to 8.4.5|8.5.6 LTS recommended| |from 8.3.0 to 8.3.4|8.5.6 LTS recommended| |from 8.2.0 to 8.2.3|8.5.6 LTS recommended| |from 8.1.0 to 8.1.4|8.5.6 LTS recommended| |from 8.0.0 to 8.0.4|8.5.6 LTS recommended| |from 7.20.0 to 7.20.3|8.5.6 LTS recommended| |from 7.19.0 to 7.19.17 LTS|8.5.6 LTS recommended or 7.19.18 LTS or 7.19.19 LTS| |from 7.18.0 to 7.18.3|8.5.6 LTS recommended or 7.19.19 LTS| |from 7.17.0 to 7.17.5|8.5.6 LTS recommended or 7.19.19 LTS| |Any earlier versions|8.5.6 LTS recommended or 7.19.19 LTS| See the release notes ([https://confluence.atlassian.com/doc/confluence-release-notes-327.html]). You can download the latest version of Confluence Data Center from the download center ([https://www.atlassian.com/software/confluence/download-archives]). This vulnerability was reported via our Bug Bounty program.

• CWE-79

• https://confluence.atlassian.com/pages/viewpage.action?pageId=1354501606Vendor Advisory
• https://jira.atlassian.com/browse/CONFSERVER-94513Issue Tracking, Vendor Advisory
• https://confluence.atlassian.com/pages/viewpage.action?pageId=1354501606Vendor Advisory
• https://jira.atlassian.com/browse/CONFSERVER-94513Issue Tracking, Vendor Advisory

Published

Feb 20, 2024

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

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