The Manage Backgrounds functionality within NagVis versions prior to 1.9.29 is vulnerable to an authenticated path traversal vulnerability. Exploitation of this results in a malicious actor having the ability to arbitrarily delete files on the local system.
https://www.synopsys.com/blogs/software-security/cyrc-advisory-nagios-xi
https://nagvis.org/downloads/changelog/1.9.29
https://lists.debian.org/debian-lts-announce/2025/05/msg00000.html