CVE-2023-22527

CVE-2023-22527 is a critical-severity (CVSS 9.8) vulnerability in Atlassian Confluence Data Center and Server. CISA added it to the Known Exploited Vulnerabilities catalog on January 24, 2024, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by February 14, 2024. CISA also lists it as known to be used in ransomware campaigns, so it should be prioritised accordingly. Atlassian has 14 vulnerabilities in the KEV catalog, 8 of them linked to ransomware.

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.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

• http://packetstormsecurity.com/files/176789/Atlassian-Confluence-SSTI-Injection.html
• https://confluence.atlassian.com/pages/viewpage.action?pageId=1333335615
• https://jira.atlassian.com/browse/CONFSERVER-93833
• http://packetstormsecurity.com/files/176789/Atlassian-Confluence-SSTI-Injection.html
• https://confluence.atlassian.com/pages/viewpage.action?pageId=1333335615
• https://jira.atlassian.com/browse/CONFSERVER-93833
• https://www.vicarius.io/vsociety/posts/pwning-confluence-via-ognl-injection-for-fun-and-learning-cve-2023-22527
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-22527