CVE-2023-43828

Vulnerability

Overview

CVE-2023-43827 describes a stored cross-site scripting (XSS) vulnerability found in Subrion CMS version 4.2.1. The flaw resides in the /panel/languages/ administrative interface, where the 'Title' parameter is not properly sanitized before being stored and later displayed. An attacker can inject arbitrary HTML or JavaScript code into this field, which will then be executed in the browser of any user who views the affected languages page [1][2].

Exploitation

Prerequisites

Exploitation requires an authenticated administrator-level account, as the languages panel is part of the backend administration area. The attacker must have access to modify language entries; once injected, the malicious payload is stored on the server and triggers every time the page is loaded by other administrators or users with sufficient privileges [1]. No other specialized network position is required beyond being able to reach the admin panel.

Impact

A successful attack can lead to session hijacking, credential theft, or the execution of arbitrary actions within the context of the victim's admin session. Since the XSS is stored, it can affect multiple users over time, making it a persistent threat to the confidentiality and integrity of the Subrion instance [2].

Mitigation

Status

Subrion CMS is an open-source project that appears to be no longer actively maintained; the latest release is 4.2.1, and no official patch has been issued for this vulnerability [3]. As a result, affected users should consider removing the vulnerable application from production environments or implementing strict Content Security Policy (CSP) headers and input validation filters as workarounds.