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.
Analysis
Analysis and contextual insights are available on OpenCVE Cloud.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Atlassian | Confluence Data Center | affected |
|
No data.
No data.
| Vendor | Product | Confidence | Versions | ||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Atlassian | Confluence Data Center | 95% |
|
Found an issue or want to improve our Enrichment? You can suggest it directly by opening an issue on our dedicated GitHub repository .
No vendor fix or workaround currently provided.
Additional remediation guidance may be available on OpenCVE Cloud.
Tracking
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No advisories yet.
Fri, 24 Jul 2026 21:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Title | High Severity Denial of Service in Atlassian Confluence Data Center |
Wed, 22 Jul 2026 19:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-400 | |
| Metrics |
ssvc
|
Tue, 21 Jul 2026 17:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| First Time appeared |
Atlassian
Atlassian confluence Data Center |
|
| CPEs | cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:* cpe:2.3:a:atlassian:confluence_data_center:9.2.10:*:*:*:*:*:*:* cpe:2.3:a:atlassian:confluence_data_center:9.2.11:*:*:*:*:*:*:* cpe:2.3:a:atlassian:confluence_data_center:9.2.12:*:*:*:*:*:*:* cpe:2.3:a:atlassian:confluence_data_center:9.2.13:*:*:*:*:*:*:* cpe:2.3:a:atlassian:confluence_data_center:9.2.14:*:*:*:*:*:*:* cpe:2.3:a:atlassian:confluence_data_center:9.2.15:*:*:*:*:*:*:* cpe:2.3:a:atlassian:confluence_data_center:9.2.17:*:*:*:*:*:*:* cpe:2.3:a:atlassian:confluence_data_center:9.2.18:*:*:*:*:*:*:* cpe:2.3:a:atlassian:confluence_data_center:9.2.19:*:*:*:*:*:*:* cpe:2.3:a:atlassian:confluence_data_center:9.2.20:*:*:*:*:*:*:* cpe:2.3:a:atlassian:confluence_data_center:9.2.21:*:*:*:*:*:*:* cpe:2.3:a:atlassian:confluence_data_center:9.2.22:*:*:*:*:*:*:* cpe:2.3:a:atlassian:confluence_data_center:9.2.2:*:*:*:*:*:*:* cpe:2.3:a:atlassian:confluence_data_center:9.2.3:*:*:*:*:*:*:* cpe:2.3:a:atlassian:confluence_data_center:9.2.4:*:*:*:*:*:*:* cpe:2.3:a:atlassian:confluence_data_center:9.2.5:*:*:*:*:*:*:* cpe:2.3:a:atlassian:confluence_data_center:9.2.6:*:*:*:*:*:*:* cpe:2.3:a:atlassian:confluence_data_center:9.2.7:*:*:*:*:*:*:* cpe:2.3:a:atlassian:confluence_data_center:9.2.8:*:*:*:*:*:*:* cpe:2.3:a:atlassian:confluence_data_center:9.2.9:*:*:*:*:*:*:* cpe:2.3:a:atlassian:confluence_data_center:9.4.1:*:*:*:*:*:*:* |
|
| Vendors & Products |
Atlassian
Atlassian confluence Data Center |
|
| References |
| |
| Metrics |
cvssV4_0
|
MITRE
Status: PUBLISHED
Assigner: atlassian
Published:
Updated: 2026-07-22T18:48:52.568Z
Reserved: 2026-01-01T00:00:40.721Z
Link: CVE-2026-21577
Vulnrichment
Updated: 2026-07-22T18:32:50.393Z
NVD
No data.
Redhat
No data.
OpenCVE Enrichment
Updated: 2026-07-24T21:30:15Z