October 5, 2023 · Applied Cybernetics Group
CVE-2023-22515 — Atlassian Confluence Data Center and Server
known ransomware use
Atlassian Confluence Data Center and Server Broken Access Control Vulnerability
- Added to KEV
2023-10-05- Federal due date
2023-10-13- Vendor
- Atlassian
- Product
- Confluence Data Center and Server
- EPSS
- 99.9th percentile (score 0.992, as of
2026-07-13) - NVD CVSS v3.1
- —
- Ransomware use
- Known
- ATT&CK
- T1059 , T1059.007 , T1078 , T1136 , T1190 · signal rollup
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2023-22515
CISA short description
Atlassian Confluence Data Center and Server contains a broken access control vulnerability that allows an attacker to create unauthorized Confluence administrator accounts and access Confluence.
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Check all affected Confluence instances for evidence of compromise per vendor instructions and report any positive findings to CISA.