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GHSA-c43v-4cr8-6mvp

LowCVSS 2 / 10
Published Jul 9, 2026·Last modified Jul 9, 2026
Affected Components(0)

No affected components available

Description

Summary

An authenticated path traversal in assets/icon allows local SVG file read by passing traversal sequences in the extension parameter. The issue is caused by file existence checks happening before extension validation.

Details

The endpoint:

  • src/controllers/AssetsController.php:1115-1123
  • actionIcon(string $extension) calls Assets::iconPath($extension) and returns sendFile($path, ...).

In Assets::iconPath():

  • Path is built from user-controlled extension:
    • src/helpers/Assets.php:906-909
  • If file_exists($path) is true, path is returned immediately:
    • src/helpers/Assets.php:910-912

Validation exists in Assets::iconSvg():

  • preg_match('/^\w+$/', $extension)
  • src/helpers/Assets.php:927-931

However, that validation is only reached if iconPath() does not find a file. So traversal payloads that resolve to existing .svg files bypass validation and are served by sendFile().

Impact

  • Authenticated users can read local .svg files accessible to the application process.

References

  • https://github.com/craftcms/cms/commit/30f5f1a8d6edf0f3a00be72c42c78d9dc7d72d5c
Risk Scores
Base Score
2.0

The vulnerability requires local access to the device to be exploited. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability.

Threat Intelligence
0.4

Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within 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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Low severity
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