# CVE-2026-21580

> CVE-2026-21580. CVSS 8.6 (CVSS 4.0).

Canonical: https://rewindex.com/cve/CVE-2026-21580
Last updated: 2026-08-26T16:46:22Z

- Published: 2026-08-18 22:00 UTC · Updated: 2026-08-26 16:46 UTC · Assigner: atlassian
- CVSS: 8.6 (CVSS 4.0) · Severity: High
- EPSS: 0.51%, 43th percentile (scored 2026-10-25)
- CISA KEV: no

## 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.

## Affected vendors and products

- Atlassian: Confluence Data Center
- Atlassian: Confluence Server

## Tracked companies

- [Confluence](https://rewindex.com/company/confluence.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-21580)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-21580)
- [https://confluence.atlassian.com/pages/viewpage.action?pageId=1821999768](https://confluence.atlassian.com/pages/viewpage.action?pageId=1821999768)
- [https://jira.atlassian.com/browse/CONFSERVER-104381](https://jira.atlassian.com/browse/CONFSERVER-104381)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-21580 · Markdown: https://rewindex.com/cve/CVE-2026-21580.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-21580 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:12:02.625Z