CVE-2022-43263 is a cross-site scripting (XSS) vulnerability identified in the Arobas Music Guitar Pro application for iPad and iPhone devices, specifically in versions prior to 1.10.2. The vulnerability arises from improper sanitization of user-supplied input in the filename of uploaded files. An attacker can craft a malicious payload embedded within the name of an uploaded file, which, when processed or viewed by the application, results in the execution of arbitrary web scripts or HTML code. This type of vulnerability falls under CWE-79 (Improper Neutralization of Input During Web Page Generation), which is a common vector for client-side attacks. The CVSS v3.1 base score is 6.1, indicating a medium severity level. The vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N) shows that the attack can be performed remotely over the network without privileges and requires user interaction (UI:R), such as opening or interacting with the malicious file. The scope is changed (S:C), meaning the vulnerability affects components beyond the initially vulnerable component, potentially impacting other parts of the application or system. The impact affects confidentiality and integrity to a low degree but does not affect availability. No known exploits have been reported in the wild, and no official patches or vendor advisories are linked in the provided data. The vulnerability specifically targets iOS versions of the Guitar Pro app, which is a specialized music notation and tablature software used by musicians for composing and editing guitar music. The attack vector is limited to users who open or interact with maliciously named files within the app, which could lead to session hijacking, theft of sensitive data within the app context, or execution of malicious scripts that could manipulate the app's behavior or data presentation.

For European organizations, the direct impact of this vulnerability is relatively limited due to the niche nature of the affected product (Guitar Pro on iOS). However, organizations involved in music production, education, or digital content creation that rely on this app could face risks such as unauthorized access to user data or manipulation of musical content. The XSS vulnerability could be exploited to steal authentication tokens or sensitive information stored within the app, potentially leading to privacy breaches. Additionally, if the app is used within corporate environments or shared devices, malicious scripts could be used to pivot attacks or gather further information. The requirement for user interaction reduces the risk of widespread automated exploitation but does not eliminate targeted attacks, especially in environments where users may be tricked into opening malicious files. Since the vulnerability affects confidentiality and integrity but not availability, the main concern is data leakage or unauthorized modification rather than service disruption. Given the app’s use on mobile devices, exploitation could also lead to broader device compromise if combined with other vulnerabilities or social engineering tactics.

1. Update the Guitar Pro app on all iPad and iPhone devices to version 1.10.2 or later, where the vulnerability has been addressed. 2. Implement strict input validation and sanitization on the client side when handling file names, ensuring that any potentially malicious scripts or HTML tags are neutralized before processing or display. 3. Educate users, especially in music production and educational institutions, about the risks of opening files from untrusted sources and the importance of verifying file origins. 4. Employ mobile device management (MDM) solutions to enforce app updates and restrict installation of unapproved applications or files. 5. Monitor network traffic and app behavior for unusual activities that could indicate exploitation attempts, such as unexpected script execution or data exfiltration. 6. For organizations distributing Guitar Pro files, implement secure file sharing practices, including scanning for malicious payloads embedded in file metadata. 7. Encourage developers and vendors to provide timely patches and detailed advisories, and consider sandboxing or isolating the app environment to limit the impact of potential script execution.