Known exploited · Atlassian
CVE-2023-22518: Atlassian Confluence Data Center and Server Improper Authorization Vulnerability
What it is
Atlassian Confluence Data Center and Server contain an improper authorization vulnerability that can result in significant data loss when exploited by an unauthenticated attacker. There is no impact on confidentiality since the attacker cannot exfiltrate any data.
- Vendor
- Atlassian
- Product
- Confluence Data Center and Server
- Added to KEV
- November 7, 2023
- CISA due date
- November 28, 2023
- Ransomware use
- Known
- Weakness
- CWE-863: Incorrect Authorization
What CISA requires
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
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 November 28, 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.