Security Advisory ZAA-2021-09 Details: ID: ZAA-2021-09 Date: 10/05/2021 Title: Privilege Escalation Severity: High Product: Zammad 1.0.x up to 4.1.0 Fixed in: Zammad 4.1.1, 5.0.0 References: → CVE: CVE-2021-42086 Vulnerability Description: Agent users should not be allowed to modify other agent or admin users. However, under special circumstances, they might be able to send specially crafted requests leading to modification of agent users that can subsequently be used to log in with admin privileges. Special Thanks: Name: Rajesh Pangare Role: Security Researcher Website: https://raj3shp.medium.com Recommended Resolution: This vulnerability is fixed in the latest versions of Zammad. It is recommended to upgrade to one of these. Fixed releases can be found at: https://zammad.org/ https://ftp.zammad.com/ Or just update your Zammad if installed via OS package manager. Additional Information: Online version of this advisory: https://zammad.com/en/advisories/zaa-2021-09 Contact for remarks: security@zammad.com