SpartnerNL Laravel Excel up to 3.1.69 Disk src/Files/Disk.php copy destination path traversal

Summaryinfo

A vulnerability marked as critical has been reported in SpartnerNL Laravel Excel up to 3.1.69. This affects the function Maatwebsite\Excel\Files\Disk::copy of the file src/Files/Disk.php of the component Disk. This manipulation of the argument destination causes path traversal. This vulnerability appears as CVE-2026-84374. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in SpartnerNL Laravel Excel up to 3.1.69. It has been declared as critical. Affected by this vulnerability is the function Maatwebsite\Excel\Files\Disk::copy of the file src/Files/Disk.php of the component Disk. The manipulation of the argument destination with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-84374 since 09/01/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

By approaching the search of inurl:src/Files/Disk.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 3.1.70 eliminates this vulnerability.

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Productinfo

Vendor

• SpartnerNL

Name

• Laravel Excel

Version

• 3.1.0
• 3.1.1
• 3.1.2
• 3.1.3
• 3.1.4
• 3.1.5
• 3.1.6
• 3.1.7
• 3.1.8
• 3.1.9
• 3.1.10
• 3.1.11
• 3.1.12
• 3.1.13
• 3.1.14
• 3.1.15
• 3.1.16
• 3.1.17
• 3.1.18
• 3.1.19
• 3.1.20
• 3.1.21
• 3.1.22
• 3.1.23
• 3.1.24
• 3.1.25
• 3.1.26
• 3.1.27
• 3.1.28
• 3.1.29
• 3.1.30
• 3.1.31
• 3.1.32
• 3.1.33
• 3.1.34
• 3.1.35
• 3.1.36
• 3.1.37
• 3.1.38
• 3.1.39
• 3.1.40
• 3.1.41
• 3.1.42
• 3.1.43
• 3.1.44
• 3.1.45
• 3.1.46
• 3.1.47
• 3.1.48
• 3.1.49
• 3.1.50
• 3.1.51
• 3.1.52
• 3.1.53
• 3.1.54
• 3.1.55
• 3.1.56
• 3.1.57
• 3.1.58
• 3.1.59
• 3.1.60
• 3.1.61
• 3.1.62
• 3.1.63
• 3.1.64
• 3.1.65
• 3.1.66
• 3.1.67
• 3.1.68
• 3.1.69

CPE 2.3info

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CPE 2.2info

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