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CVE-2026-21580PATCHED
atlassian · confluence data center

CVE-2026-21580: This Critical severity Stored XSS, PrivEsc (Privilege Escalation), and Security Misconfiguration vulnerability was intro

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 Products

VendorProductVersions
atlassianconfluence data center10.2.0 to 10.2.11, 10.1.0 to 10.1.2, 10.0.2 to 10.0.3, 9.5.1 to 9.5.4, 9.4.0 to 9.4.1, 9.3.1 to 9.3.2, 9.2.0 to 9.2.20, 9.1.0 to 9.1.1, 9.0.3, 8.9.6 to 8.9.8, 8.5.15 to 8.5.31, 7.19.27 to 7.19.30, 8.5.15 to 8.5.31, 7.19.27 to 7.19.30

References

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

Related News (1 articles)

Tier C
VulDB5d ago
CVE-2026-21580 | Atlassian Confluence Data Center/Confluence Server cross site scripting
→ No new info (linked only)
CISA KEV❌ No
Actively exploited❌ No
Patch available
10.2.13 to 10.2.159.2.21 to 9.2.23
PublishedAug 18, 2026
Trending Score18
Source articles1
Independent1
Info Completeness0/14
Missing: cve_id, title, description, vendor, product, versions, cvss, epss, cwe, kev, exploit, patch, iocs, mitre_attack

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Related CVEs (5)

NONECVE-2026-21582
CVE-2026-21582: This High severity BASM (Broken Authentication & Session Management) vulnerability known as CVE-2026-21582 was introduce
Trending: 20
NONECVE-2026-21584
CVE-2026-21584: This High severity Improper Authorization vulnerability was introduced in versions 10.0.0, 10.1.0, 10.2.0, 11.0.0, 12.0.
Trending: 13
NONECVE-2026-21579
CVE-2026-21579: This High severity Information Disclosure vulnerability was introduced in versions 7.17.0, 7.19.0, 8.5.0, 8.9.0, 9.0.1,
Trending: 2
NONECVE-2026-21577
CVE-2026-21577: This High severity DoS (Denial of Service) vulnerability was introduced in versions 9.0.1, 9.1.0, 9.2.0, 9.3.1, 9.4.0, 9
Trending: 2
CRITICALPRE-CVE
Multiple Critical Vulnerabilities in Atlassian Products
Trending: 1

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Verification

State: unverified
Confidence: 0%

Vulnerability Timeline

CVE Published
Aug 18, 2026
Discovered by ZDM
Aug 18, 2026
Patch Available
Aug 21, 2026