CVE-2023-22515: in the CISA KEV catalogue

Atlassian Confluence Data Center and Server Broken Access Control Vulnerability. CISA added CVE-2023-22515 to the Known Exploited Vulnerabilities catalogue on 2023-10-05 with a default due date of 2023-10-13. Known ransomware campaign use: Known. Forensic triage flag: No.

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. (CISA description)

Vendor / product: Atlassian Confluence Data Center and Server
CWE: Not listed
CISA 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.
EPSS: 99%, percentile 99 (scored 2026-11-03)

EPSS puts about 99 in 100 odds (99%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 99% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.

Vendor and reference links (from CISA)

Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.

Data dates. CISA KEV catalogue version 2026.11.03, released 2026-11-03, 1,767 entries (checked 2026-11-03). EPSS model v2026.06.15, scored 2026-11-03, 399,388 CVEs. Sources: CISA and FIRST (EPSS by FIRST; scores generated by Empirical Security). Copied to our own database and refreshed automatically; if a refresh fails, the previous copy keeps serving with its own date.

Frequently asked questions

Is CVE-2023-22515 in the CISA KEV catalogue?

Yes. CISA added CVE-2023-22515 (Atlassian Confluence Data Center and Server Broken Access Control Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2023-10-05. CISA's default due date for it is 2023-10-13.

Is CVE-2023-22515 used in ransomware attacks?

CISA marks known ransomware campaign use as Known for CVE-2023-22515.

What should I do about CVE-2023-22515?

CISA's 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.

Sources

CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
NVD record for CVE-2023-22515