Znuny LTS 6.5.21

Release Information:

Release Date	27-MAY-2026
Release Type	Patchlevel with security fixes
Download	https://download.znuny.org/releases/znuny-6.5.21.tar.gz
GitHub	znuny/Znuny

Security Vulnerabilities Fixed

• CVE-2025-26843: Fixed infinite loop when replacing tags in the template generator.

• CVE-2025-59490: Follow-up fix for scrambled script tags.

• Fixed XSS via JavaScript in URL parameters in the communication log admin view.

• Fixed XSS in user preferences DB.

Changes

• Changed the name of the user with ID 1.

Fixed Issues

• Fixed package manager not using the user ID for package operations.

Read about all changes in the CHANGES.md. See the commits on GitHub for a list of all changes.