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CVE-2026-128023

7.4, high

FrankenPHP before 1.13.0 contains an authentication bypass vulnerability that allows unauthenticated attackers to spoof trusted headers…

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
7.4, high high CVSS v3.1
EPSS, next 30 days
0.5% higher than 44.1% of scored CVEs
Exploitation
No public evidence
Published
13 Nov 2026yesterday

Description

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.

Details

Vendor
PHP
Product
frankenphp
Weakness
CWE-290 (opens in a new tab)
Status
Deferred
Updated
13 Nov 2026
Assigner
disclosure@vulncheck.com

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References 2

Advisories 1

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other PHP CVEs

Every PHP CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2019-11043 PHP FastCGI Process Manager (FPM) Buffer Overflow Vulnerability KEV EPSS 100% 9.8, critical
  • CVE-2016-10033 PHPMailer Command Injection Vulnerability KEV EPSS 100% 9.8, critical
  • CVE-2012-1823 PHP-CGI Query String Parameter Vulnerability KEV EPSS 100% 9.8, critical
  • CVE-2026-128027 FrankenPHP Docker images before 1.1.11 were rebuilt only when new base image tags were created, so security fixes that Alpine, PHP, and… EPSS 0.9% 9.8, critical
  • CVE-2026-128014 PHP frankenphp Out-of-Bounds Write Vulnerability EPSS 0.7% 8.1, high

Beyond this page

Is CVE-2026-128023 in your network?

This page tells you how dangerous CVE-2026-128023 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 14 Nov 2026, not the live upstream state.