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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 (3 articles)

Tier B
CERT-FR28d ago
Multiples vulnérabilités dans les produits Atlassian (27 juillet 2026)
→ No new info (linked only)
Tier B
BSI Advisories32d ago
[NEU] [hoch] Atlassian Bamboo, Bitbucket, Confluence, Fisheye, Crucible, Jira und Jira Service Management: Mehrere Schwachstellen
→ No new info (linked only)
Tier C
VulDB33d 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 enriched33d agov2
Trending Score2
Source articles3
Independent3
Info Completeness8/14
Missing: epss, cwe, kev, exploit, 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-2026-21580
CVE-2026-21580: This Critical severity Stored XSS, PrivEsc (Privilege Escalation), and Security Misconfiguration vulnerability was intro
Trending: 18
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
CRITICALPRE-CVE
Multiple Critical Vulnerabilities in Atlassian Products
Trending: 1

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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 33d ago
v2Tier C33d ago

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

cvssEstimate
via VulDB
v133d ago

Initial creation