Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2025-2817

Thunderbird's update mechanism allowed a medium-integrity user process to interfere with the SYSTEM-level updater by manipulating the file-locking behavior. By injecting code into the user-privileged process, an attacker could bypass intended access controls, allowing SYSTEM-level file operations on paths controlled by a non-privileged user and enabling privilege escalation. This vulnerability affects Firefox < 138, Firefox ESR < 128.10, Firefox ESR < 115.23, Thunderbird < 138, and Thunderbird < 128.10.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 17.6%
CVSS Severity
CVSS v3 Score 8.8
Products affected by CVE-2025-2817


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