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CVE-2026-21588PATCHED
atlassian · confluence data center

CVE-2026-21588: This High severity DoS (Denial of Service) vulnerability was introduced in versions 8.9.0, 9.0.1, 9.1.0, 9.2.0, 9.3.1, 9

Description

This High severity DoS (Denial of Service) vulnerability was introduced in versions 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. This DoS (Denial of Service) vulnerability, with a CVSS Score of 7.1, allows an authenticated attacker to cause a resource to be unavailable for its intended users by temporarily or indefinitely disrupting services of a host connected to a network. Atlassian recommends that Confluence Data Center 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 9.2: Upgrade to a release greater than or equal to 9.2.24 Confluence Data Center 10.2: Upgrade to a release greater than or equal to 10.2.17 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 Penetration Testing program.

Affected Products

VendorProductVersions
atlassianconfluence data center10.2.0 to 10.2.15, 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 9.2.23, 9.1.0 to 9.1.1, 8.9.7 to 8.9.8

References

  • https://confluence.atlassian.com/pages/viewpage.action?pageId=1822852209
  • https://jira.atlassian.com/browse/CONFSERVER-104451

Related News (1 articles)

Tier C
VulDB12d ago
CVE-2026-21588 | Atlassian Confluence Data Center up to 10.2.0 denial of service
→ No new info (linked only)

Discussion (0)

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CISA KEV❌ No
Actively exploited❌ No
Patch available
10.2.17 to 10.2.189.2.24 to 9.2.25
CWECWE-400
PublishedSep 15, 2026
Last enriched12d ago
Trending Score4
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)

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CVE-2026-21582: This High severity BASM (Broken Authentication & Session Management) vulnerability known as CVE-2026-21582 was introduce
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CVE-2026-21586: This High severity Improper Authorization vulnerability was introduced in versions 7.4.0, 7.13.0, 8.5.0, 8.9.0, 9.0.1, 9
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NONECVE-2026-21587
CVE-2026-21587: This High severity Improper Authorization vulnerability was introduced in version 11.3.0 of Jira Service Management Data
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NONECVE-2026-21580
CVE-2026-21580: This Critical severity Stored XSS, PrivEsc (Privilege Escalation), and Security Misconfiguration vulnerability was intro
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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

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Verification

State: unverified
Confidence: 0%

Vulnerability Timeline

CVE Published
Sep 15, 2026
Discovered by ZDM
Sep 15, 2026
Patch Available
Sep 15, 2026