CVE-2025-2817
High
Description
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 was fixed in Firefox 138, Firefox ESR 128.10, Firefox ESR 115.23, Thunderbird 138, and Thunderbird 128.10.
SeverityHigh
CVSS8.8
Exploit probability—
Product
Mozilla Firefox
PublishedApr 29, 2025
First seenApr 29, 2025
Weakness typeCWE-22Path traversal
How to fix
Update
- mozilla firefox115.23.0, 138.0, 128.10.0 or later
- mozilla thunderbird128.10.0, 138.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 115.23.0, v < 138.0, 116.0 ≤ v < 128.10.0 | 115.23.0, 138.0, 128.10.0 |
| mozilla thunderbird | v < 128.10.0, 129.0 ≤ v < 138.0 | 128.10.0, 138.0 |
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