CVE-2026-85733
MediumCVSS 5.3Summary
FrankenPHP is a modern application server for PHP. Prior to 1.12.5, the official FrankenPHP Debian and Alpine Docker images include a default /app/public/index.php that executes phpinfo(). A derived image that does not overwrite this placeholder serves the diagnostics page in production and can disclose environment variables used for secrets, PHP configuration directives, loaded extensions, software versions, and system paths. Images built using the documented pattern with their own /app/public/index.php are not affected, and already derived images must be rebuilt or supplied with an application index to remove the exposed placeholder. This issue is fixed in version 1.12.5.
Risk Assessment
An unauthenticated user can access the phpinfo() page and learn secrets, configuration, and software versions, facilitating further attacks. The risk applies to production deployments based on default FrankenPHP images.
Recommendation
Upgrade FrankenPHP to version 1.12.5 or later and rebuild derived images with your own /app/public/index.php. Ensure the phpinfo() page is not publicly accessible.
Other vulnerabilities in FrankenPHP
See all- CVE-2026-82416High
FrankenPHP is a modern application server for PHP. Prior to 1.12.5, in worker mode, when the session extension is loaded as a shared module, PHP session state can be retained between requests, leading to cross-user session exposure and possible session hijacking.
- CVE-2026-45062High
FrankenPHP is a modern application server for PHP, which in versions from 1.11.2 to before 1.12.3 has an issue in the splitPos() function in cgi.go. This flaw allows an attacker to mislead the server into treating a non-PHP file as a PHP script, potentially leading to remote code execution.
Original NVD description (English source)
FrankenPHP is a modern application server for PHP. Prior to 1.12.5, the official FrankenPHP Debian and Alpine Docker images include a default /app/public/index.php that executes phpinfo(). A derived image that does not overwrite this placeholder serves the diagnostics page in production and can disclose environment variables used for secrets, PHP configuration directives, loaded extensions, software versions, and system paths. Images built using the documented pattern with their own /app/public/index.php are not affected, and already derived images must be rebuilt or supplied with an application index to remove the exposed placeholder. This issue is fixed in version 1.12.5.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS