CVE-2026-21588
Quick assessment
Affected
Atlassian Confluence Data Center
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
以下是该漏洞描述信息的中文翻译： 此高危服务拒绝（DoS，Denial of Service）漏洞存在于 Confluence Data Center 的以下版本中：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 和 10.2.0。 该 DoS（服务拒绝）漏洞的 CVSS 评分为 7.1。该漏洞允许已认证的攻击者通过暂时或永久性地中断连接至网络的某主机的服务，从而使其资源对预期用户不可用。 Atlassian 建议 Confluence Data Ce
Possible ATT&CK Techniques 2 AI
T1082 · System Information Discovery T1499 · Endpoint Denial of ServiceAffected Version Matrix 11
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Atlassian | Confluence Data Center | 10.2.0 to 10.2.15 |
affected |
10.1.0 to 10.1.2 |
affected | ||
10.0.2 to 10.0.3 |
affected | ||
9.5.1 to 9.5.4 |
affected | ||
9.4.0 to 9.4.1 |
affected | ||
9.3.1 to 9.3.2 |
affected | ||
9.2.0 to 9.2.23 |
affected | ||
9.1.0 to 9.1.1 |
affected | ||
| … +3 more rows | |||
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I. Basic Information for CVE-2026-21588
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Atlassian | Confluence Data Center | 10.2.0 to 10.2.15 | - |
|
II. Public POCs for CVE-2026-21588
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-21588 (1)
Vendor Pages for CVE-2026-21588 (1)
Same Patch Batch · Atlassian · 2026-09-15 · 3 CVEs total
| CVE-2026-21586 | 7.1 HIGH | CVE-2026-21586 |
| CVE-2026-21587 | 7.1 HIGH | CVE-2026-21587 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-21588
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