CVE-2026-128023
Published:November 13, 2026
Updated:November 13, 2026
FrankenPHP before 1.13.0 contains an authentication bypass vulnerability that allows unauthenticated attackers to spoof trusted headers by sending dot-form header names that PHP rewrites to underscores. Attackers can send headers like X.Authenticated.User or X.Forwarded.For that map to $_SERVER keys, spoofing user identity, client IP, or scheme.
Affected Packages
https://github.com/php/frankenphp.git (GITHUB):
Affected version(s) >=v1.0.0-beta.1 <v1.13.0Fix Suggestion:
Update to version v1.13.0github.com/dunglas/frankenphp (GO):
Affected version(s) >=v1.0.0-beta.1 <v1.13.0Fix Suggestion:
Update to version v1.13.0Related Resources (3)
Do you need more information?
Contact UsCVSS v4
Base Score:
9.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.4
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Authentication Bypass by Spoofing