CVE-2025-23001 (CVSS 6.1)

Description

A Host header injection vulnerability exists in CTFd 3.7.5, due to the application failing to properly validate or sanitize the Host header. An attacker can manipulate the Host header in HTTP requests, which may lead to phishing attacks, reset password, or cache poisoning. NOTE: the Supplier's position is that the end user is supposed to edit the NGINX configuration template to set server_name (with this setting, Host header injection cannot occur).

Is your site exposed to CVE-2025-23001?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

6.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness Type (CWE)

CWE-644 CWE-644

References

Other References

https://blog.ctfd.io/ctfd-3-7-6/ https://codetoanbug.com/poc-cve-2025-23001-ctfd-english/ https://github.com/CTFd/CTFd

Frequently Asked Questions

What is CVE-2025-23001? +

A Host header injection vulnerability exists in CTFd 3.7.5, due to the application failing to properly validate or sanitize the Host header. An attacker can manipulate the Host header in HTTP requests, which may lead to phishing attacks, reset password, or cache poisoning. NOTE: the Supplier's position is that the end user is supposed to edit the NGINX configuration template to set server_name (with this setting, Host header injection cannot occur). It has a CVSS v3.1 base score of 6.1 (MEDIUM).

How severe is CVE-2025-23001? +

CVE-2025-23001 has a CVSS v3.1 score of 6.1 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

How do I check if I'm vulnerable to CVE-2025-23001? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-10836

Improper handling of HTTP headers that allows a remote attacker to manipulate the value of the Host header using specially …

CVE-2026-55791

Craft CMS is a content management system (CMS). Versions 4.0.0-RC1 and above, prior to 4.18.0 and 5.0.0-RC1, and above, prior …

CVE-2023-47143 10.0

IBM Tivoli Application Dependency Discovery Manager 7.3.0.0 through 7.3.0.10 is vulnerable to HTTP header injection, caused by improper validation of …

CVE-2025-64484 8.5

OAuth2-Proxy is an open-source tool that can act as either a standalone reverse proxy or a middleware component integrated into …

CVE-2024-10006 8.3

A vulnerability was identified in Consul and Consul Enterprise (“Consul”) such that using Headers in L7 traffic intentions could bypass …

CVE-2026-48126 8.2

Algernon is a small self-contained pure-Go web server. Prior to 1.17.8, when algernon is started with --domain (or --letsencrypt, which …

CVE-2025-23001