CVE-2025-2817

Summary

CVE-2025-2817 is a vulnerability affecting Thunderbird and certain versions of Firefox. The update mechanism in Thunderbird allows a medium-integrity user process to interfere with the SYSTEM-level updater. By manipulating file-locking behavior, an attacker can inject code into the user-privileged process, bypassing intended access controls. This enables the attacker to perform SYSTEM-level file operations on paths controlled by a non-privileged user, leading to privilege escalation. Firefox versions below 138, Firefox ESR below 128.10, Firefox ESR below 115.23, Thunderbird below 138, and Thunderbird below 128.10 are all affected.

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