Atlassian has been made aware of an issue reported by a handful of customers where external attackers may have exploited a previously unkno…

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.

1. 2023-10-04 0-day patched (Project Zero)
2. 2023-10-04 First public exploit (Metasploit auxiliary/admin/http/atlassian_confluence_auth_bypass)
3. 2023-10-04 Published
4. 2023-10-05 Added to CISA KEV
5. 2023-10-13 CISA patch deadline
6. 2023-12-09 CISA SSVC: exploitation active

Added

3 y ago (2023-10-05)

Patch by

2023-10-13 (3 y ago)

Ransomware

Known to be used in ransomware campaigns

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.

Vendor, product

Atlassian, Confluence Data Center and Server

CISA name

Atlassian Confluence Data Center and Server Broken Access Control Vulnerability

Detected in real attacks while still unknown to the vendor and the public, per Google Project Zero's 0day In-the-Wild tracker.

Patched

2023-10-04

Details

project zero tracker

Groups reported to have exploited it in intrusions.

• RansomHub ransomware gang

reported by cisa.gov

Ransomware Vulnerability Matrix by BushidoUK (github.com/BushidoUK/Ransomware-Vulnerability-Matrix), reformatted per CVE. CC BY 4.0

How it is exploited and what it leads to, in MITRE ATT&CK terms.

• T1190 Exploit Public-Facing Application exploitation
• T1059.007 JavaScript primary impact
• T1136 Create Account primary impact
• T1059 Command and Scripting Interpreter secondary impact
• T1078 Valid Accounts secondary impact

kev release 2025-07-28, att&ck v16.1. KEV to ATT&CK mappings by the MITRE Center for Threat-Informed Defense (Mappings Explorer, Apache-2.0). © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. Terms of use

Exploitation

Active, exploited in the wild

Automatable

yes

Technical impact

total

Assessed

2 y ago (2023-12-09)

99.23% chance of exploitation in the next 30 days, higher than 99.9% of all scored CVEs (FIRST EPSS, 2026-11-08).

• Metasploit auxiliary/admin/http/atlassian_confluence_auth_bypass Atlassian Confluence Data Center and Server Authentication Bypass via Broken Access Control metasploit auxiliary, normal rank, 2023-10-04
• Metasploit exploit/multi/http/atlassian_confluence_rce_cve_2023_22515 Atlassian Confluence Unauthenticated Remote Code Execution metasploit exploit, excellent rank, 2023-10-04
• Nuclei template Atlassian Confluence - Privilege Escalation nuclei detection template
• packetstormsecurity.com http://packetstormsecurity.com/files/175225/Atlassian-Confluence-Unauthenticated-Remote-Code-Execution.html referenced PoC, tagged "exploit" by a source, unverified

• Atlassian Confluence Data Center
• Atlassian Confluence Server

Weakness

• CWE-20 Improper Input Validation

• packetstormsecurity.com /files/175225/Atlassian-Confluence-Unauthenticated-Remote-Code-Execution.html

  exploit, third-party-advisory, vdb-entry

• confluence.atlassian.com /display/KB/FAQ+for+CVE-2023-22515

  vendor-advisory

• confluence.atlassian.com /pages/viewpage.action?pageId=1295682276

  vendor-advisory

• jira.atlassian.com /browse/CONFSERVER-92475

  issue-tracking, vendor-advisory

• cisa.gov /known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-22515

  government-resource, us-government-resource

• CVE List CVE-2023-22515
• NVD CVE-2023-22515

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.