CVE-2023-44766

MEDIUM

Concrete CMS 9.2.1 - Stored Cross-Site Scripting in SEO Extra Field

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2023-44766. PoCs published by sromanhu.

AI-analyzed exploit summary This repository demonstrates a stored XSS vulnerability in ConcreteCMS v9.2.1 via the 'Header Extra Content' field in SEO settings. The provided payload bypasses sanitization and executes arbitrary JavaScript when a user accesses the affected page.

Description

A Cross Site Scripting (XSS) vulnerability in Concrete CMS v.9.2.1 allows an attacker to execute arbitrary code via a crafted script to the SEO - Extra from Page Settings. NOTE: the vendor disputes this because this SEO-related header change can only be made by an admin, and allowing an admin to place JavaScript there is an intentional customization feature.

Exploits (1)

nomisec WORKING POC
by sromanhu · poc
https://github.com/sromanhu/CVE-2023-44766_ConcreteCMS-Stored-XSS---SEO

This repository demonstrates a stored XSS vulnerability in ConcreteCMS v9.2.1 via the 'Header Extra Content' field in SEO settings. The provided payload bypasses sanitization and executes arbitrary JavaScript when a user accesses the affected page.

Classification
Working Poc 90%
Attack Type
Xss
Complexity
Trivial
Reliability
Reliable
Target: ConcreteCMS v9.2.1
Auth required
Prerequisites: Access to ConcreteCMS admin panel · Ability to modify SEO settings
devstral-2 · analyzed Feb 19, 2026 Full analysis →

References (2)

Core 2

Scores

CVSS v3 4.8
EPSS 0.0019
EPSS Percentile 40.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Details

CWE
CWE-79
Status published
Products (2)
concrete5/concrete5 0Packagist
concretecms/concrete_cms 9.2.1
Published Oct 06, 2023
Tracked Since Feb 18, 2026