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Fencer Vulns
critical 10.0

CVE-2023-22527 kev+ ransomware in the critical feed json

A template injection vulnerability on older versions of Confluence Data Center and Server allows an unauthenticated attacker to achieve RCE…

published 2024-01-16 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-26667

cvss
10.0
version 3.0, CNA
cisa kev
Exploited
added 2024-01-24, used in ransomware
epss
100.0%
EPSS 100.0% chance of exploitation in 30 days, percentile 99.9%
public exploits
1
Metasploit, plus a Nuclei check

Summary

A template injection vulnerability on older versions of Confluence Data Center and Server allows an unauthenticated attacker to achieve RCE on an affected instance. Customers using an affected version must take immediate action.

Most recent supported versions of Confluence Data Center and Server are not affected by this vulnerability as it was ultimately mitigated during regular version updates. However, Atlassian recommends that customers take care to install the latest version to protect their instances from non-critical vulnerabilities outlined in Atlassian’s January Security Bulletin.

Patch / fix

cisa required action Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

  • Atlassian Confluence Data Center < 8.0.0, >= 8.5.4, >= 8.6.0, >= 8.7.1
  • Atlassian Confluence Server < 8.0.0, >= 8.5.4, >= 8.6.0
  • atlassian confluence_data_center 8.5.4
  • atlassian confluence_server 8.5.4

Timeline

  1. First public exploit (Metasploit exploit/multi/http/atlassian_confluence_rce_cve_2023_22527)
  2. Published
  3. Added to CISA KEV
  4. CISA patch deadline
  5. CISA SSVC: exploitation active

Known exploited

Added
2 y ago
Patch by
2024-02-14 (2 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.
Vendor, product
Atlassian, Confluence Data Center and Server
CISA name
Atlassian Confluence Data Center and Server Template Injection Vulnerability

Ransomware

Groups reported to have exploited it in intrusions.

  • LockBit ransomware gang

reported by thedfirreport.com

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

ATT&CK techniques

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

  • T1221 Template Injection exploitation
  • T1496 Resource Hijacking primary 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

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
yes
Technical impact
total
Assessed
2 y ago

Exploit prediction

99.98% chance of exploitation in the next 30 days, higher than 99.9% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

CVSS scores

assigned by version score vector
CNA 3.0 10.0 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Atlassian Confluence Data Center
  • Atlassian Confluence Server
  • atlassian confluence_data_center
  • atlassian confluence_server

Classification

Weakness
  • CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component

References

Sources

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.