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CVE-2026-21580

HIGH
8.6
CVSS Score
Published: August 18, 2026 at 10:00 PM UTC
Updated: August 26, 2026 at 05:01 PM UTC
2 products affected across 1 vendorConfluence ServerConfluence Data Center

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Severity
HIGH8.6
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Confluence Data Center· Atlassianatlassian-app
95%
10.0.2 ≤ v ≤ 10.0.310.1.0 ≤ v ≤ 10.1.210.2.0 ≤ v ≤ 10.2.117.19.27 ≤ v ≤ 7.19.308.5.15 ≤ v ≤ 8.5.318.9.6 ≤ v ≤ 8.9.89.1.0 ≤ v ≤ 9.1.19.2.0 ≤ v ≤ 9.2.209.3.1 ≤ v ≤ 9.3.29.4.0 ≤ v ≤ 9.4.19.5.1 ≤ v ≤ 9.5.48.5.228.5.238.5.248.5.258.5.268.5.278.5.288.5.298.5.308.5.319.0.39.2.109.2.119.2.129.2.139.2.149.2.159.2.169.2.179.2.189.2.199.2.29.2.209.2.39.2.49.2.59.2.69.2.79.2.89.2.99.4.1
Vendor states this is fixed in 10.2.13 to 10.2.15 (unaffected)
Vendor states this is fixed in 9.2.21 to 9.2.23 (unaffected)
Confluence Server· Atlassianatlassian-app
95%
7.19.27 ≤ v ≤ 7.19.308.5.15 ≤ v ≤ 8.5.318.5.228.5.238.5.248.5.258.5.268.5.278.5.288.5.298.5.308.5.31

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

Source: cverecord
https://confluence.atlassian.com/pages/viewpage.action?pageId=1821999768
Source: cverecord
https://jira.atlassian.com/browse/CONFSERVER-104381

SSVC — Action Prioritization

SSVCNo known exploitAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.6HIGHatlassian
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-79

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