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GHSA-mmj4-63m4-r6h5

CriticalCVSS 9.8 / 10
Published Aug 7, 2026·Last modified Aug 7, 2026
Affected Components(1)
Packagist logocodeigniter4/framework
< 4.7.4
Description

Impact

This is an unsafe file upload validation vulnerability that can lead to remote code execution in vulnerable application configurations.

Applications are impacted when they:

  • validate uploads using is_image or mime_in without an independent safe extension check, such as ext_in on patched versions
  • save uploaded files using the client-supplied filename
  • place uploads in a web-accessible directory where PHP files can execute

Patches

Upgrade to v4.7.4 or later.

Workarounds

  • Save uploads outside the public web root, preferably under writable/uploads.
  • Use $file->store() or $file->move($path, $file->getRandomName()) instead of preserving the original client filename.
  • Disable script execution in any public upload directory.
  • Manually verify the client filename extension before moving the file.
  • For image uploads, reject files when $file->getClientExtension() is not an allowed image extension.
  • For exact MIME-type validation, reject files when $file->getClientExtension() does not match $file->guessExtension().
Risk Scores
Base Score
9.8

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.

Threat Intelligence
9.0

Active exploitation in the wild has been confirmed. Immediate patching or mitigation is required.

EPSS
0.49%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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