What is CVE-2026-85733?

CVE-2026-85733 is a medium-severity vulnerability in PHP Frankenphp, classified under Information Disclosure. CVSS score: 5.3/10. Published 2026-10-13.

How severe is CVE-2026-85733?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Information disclosure in PHP Frankenphp

CVE-2026-85733

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 class: Information Disclosure

Published 2026-10-13 · last modified 2026-10-13.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

PHP Frankenphp — versions < 1.12.5

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

Frequently asked questions

What is CVE-2026-85733?: CVE-2026-85733 is a medium-severity vulnerability in PHP Frankenphp, classified under Information Disclosure. CVSS score: 5.3/10. Published 2026-10-13.
How severe is CVE-2026-85733?: Medium severity. CVSS v3 base score is 5.3 out of 10.