CVE-2026-61457

Summary

The Grav API plugin (getgrav/grav-plugin-api) before 1.0.3 contains a file upload extension bypass in the API media controller. HandlesMediaUploads::validateFileExtension() inspects only the final file extension via pathinfo($filename, PATHINFO_EXTENSION), so a user with api.media.write permission can upload a file with a double extension such as shell.php.jpg to bypass the dangerous extensions blocklist. The web server may then execute the file as PHP, resulting in remote code execution.

Affected Software

Weaknesses

• CWE-434: Unrestricted Upload of File with Dangerous Type

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: total

Additional References

• https://github.com/getgrav/grav/security/advisories/GHSA-66v2-vxxf-xc3v

References

• https://github.com/getgrav/grav/security/advisories/GHSA-66v2-vxxf-xc3v
• https://www.vulncheck.com/advisories/grav-before-remote-code-execution-via-file-upload-extension-bypass

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