Known exploited · Atlassian
CVE-2023-22515: Atlassian Confluence Data Center and Server Broken Access Control Vulnerability
What it is
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.
- Vendor
- Atlassian
- Product
- Confluence Data Center and Server
- Added to KEV
- October 5, 2023
- CISA due date
- October 13, 2023
- Ransomware use
- Known
- Weakness
- Not mapped by CISA
What CISA requires
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.
Forensic triage
No
What to do now
- Find every instance of Confluence Data Center and Server you run, including the forgotten ones, and check its version against the vendor advisory.
- Apply the vendor's fix or mitigation, before October 13, 2023 if you are bound by CISA's deadline, sooner if it faces the internet.
- Assume it was tried against you already: look for signs of exploitation from the date it was added, not from the day you patched.
References
H2 Security
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Start freeSource: CISA Known Exploited Vulnerabilities Catalog (public domain), catalog version 2026.10.01.