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7.1
CVE-2026-21577PATCHED
Atlassian · Confluence Data Center

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

Description

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, 9.5.1, 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 9.2.17 Confluence Data Center 10.2: Upgrade to a release greater than or equal to 10.2.7 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 10.2.6, 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 9.2.15, 9.1.0 to 9.1.1, 9.0.1 to 9.0.3

Also Affects

Downstream vendors/products affected by this vulnerability

VendorProductSourceConfidence
atlassianfisheyecert_advisory90%
atlassianbamboocert_advisory90%
atlassianbitbucketcert_advisory90%
atlassianconfluencecert_advisory90%
atlassiancruciblecert_advisory90%

References

  • https://confluence.atlassian.com/pages/viewpage.action?pageId=1821999345
  • https://jira.atlassian.com/browse/CONFSERVER-104334

Related News (2 articles)

Tier B
BSI Advisories10h ago
[NEU] [hoch] Atlassian Bamboo, Bitbucket, Confluence, Fisheye, Crucible, Jira und Jira Service Management: Mehrere Schwachstellen
→ No new info (linked only)
Tier C
VulDB1d ago
CVE-2026-21577 | Atlassian Confluence Data Center denial of service
→ No new info (linked only)
CVSS 3.17.1 NONE
CISA KEV❌ No
Actively exploited❌ No
Patch available
10.2.7 to 10.2.149.2.17 to 9.2.22
PublishedJul 21, 2026
Last enriched1d agov2
Trending Score30
Source articles2
Independent2
Info Completeness8/14
Missing: epss, cwe, kev, exploit, iocs, mitre_attack

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Related CVEs (3)

HIGHCVE-2026-21575
CVE-2026-21575: This High severity RCE (Remote Code Execution) vulnerability was introduced in version 3.4.11 of Sourcetree for Mac and
Trending: 42
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: 30
CRITICALPRE-CVE
Multiple Critical Vulnerabilities in Atlassian Products
Trending: 30

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Verification

State: verified
Confidence: 0%

Vulnerability Timeline

CVE Published
Jul 21, 2026
Discovered by ZDM
Jul 21, 2026
Updated: cvssEstimate
Jul 21, 2026
Patch Available
Jul 22, 2026

Version History

v2
Last enriched 1d ago
v2Tier C1d ago

Updated severity from NONE to HIGH and populated CVSS score of 7.1 based on article confirmation.

cvssEstimate
via VulDB
v11d ago

Initial creation