What’s Vulnerable › Vulnerabilities

CVE-2026-61457: Grav before 1.0.3 Remote Code Execution via File Upload Extension Bypass

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-15 · updated 2026-10-24
• Weakness: CWE-434

Description

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 products

• getgrav grav: before 1.0.3 — fixed in 1.0.3

How to fix

Upgrade to a fixed version: getgrav grav 1.0.3. Check the vendor advisory for mitigations.

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

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