CVE-2023-22527: Atlassian Confluence Data Center and Server Template Injection Vulnerability

Vulnerability summary

CVE-2023-22527 is a critical (CVSS 10.0) vulnerability in Atlassian Confluence Data Center and Server. It is known to be exploited: CISA lists it, first on 24-01-2024. It has been used in ransomware campaigns. EPSS estimates a 99.98% chance of exploitation in the next 30 days, higher than 99.9% of scored vulnerabilities. 3 public exploits are recorded. Fixed in 8.5.4, 8.6.0, 8.7.1 and 8.5.4, 8.6.0.

Timeline

1. 16-01-2024
   PublishedVulnerability first disclosed.
2. 24-01-2024
   Added to CISA KEVExploitedAtlassian Confluence Data Center and Server Template Injection Vulnerability
3. 14-02-2024
   CISA remediation dueDeadline passedApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
4. 21-10-2025
   Last modifiedVulnerability information updated.

Description

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.

• CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream ComponentThe product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.