CVE-2026-84374 Laravel Excel writes exports outside the configured filesystem disk when given a caller-controlled path
Attackers can overwrite arbitrary files via path traversal in Laravel Excel exports, potentially achieving remote code execution if PHP files are targeted.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-84374?
CVE-2026-84374 is a high-severity path traversal vulnerability in SpartnerNL Laravel-Excel, published on 1 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Laravel Excel provides supercharged Excel exports and imports in Laravel. From 3.1.8 until 3.1.70, in src/Files/Disk.php the Maatwebsite\Excel\Files\Disk::copy() method resolves the caller-controlled $destination supplied through Excel::store(), $export->store(), or storeExcel() against the process working directory with realpath() instead of the configured filesystem disk. If the path names an existing writable file, Disk::copy() opens it with fopen() in rb+ mode and uses stream_copy_to_stream(), bypassing Flysystem path confinement and allowing an attacker whose application input controls the export path to overwrite arbitrary existing files with export content. The rb+ behavior creates a non-truncating overwrite and trailing bytes when the new export is shorter, and overwriting an executable PHP file can lead to remote code execution. This issue is fixed in version 3.1.70.
Which versions are affected by CVE-2026-84374?
2 open source packages ship an affected version, including maatwebsite/excel.
| Package | Affected | Fixed in |
|---|---|---|
maatwebsite/excel Packagist | From 3.1.8 | 3.1.70 |
maatwebsite/excel Packagist | From 3.1.8 | 3.1.70 |
How do I fix CVE-2026-84374?
Upgrade maatwebsite/excel to 3.1.70 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-84374 being exploited?
There is no known exploitation of CVE-2026-84374 in the wild and no public exploit code.
Sources
Also known as GHSA-c7r6-vx3h-w5g2.