CVE-2024-49265 identifies a Cross-site Scripting (XSS) vulnerability in the Booking.com Banner Creator software developed by SPBooking.com, affecting all versions up to 1.4.6. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, which allows attackers to inject malicious JavaScript code into the banner content. When a victim loads a page containing the compromised banner, the injected script executes in the victim’s browser context. This can lead to various malicious outcomes such as session hijacking, theft of cookies or credentials, defacement, or redirection to phishing or malware sites. The vulnerability is classified as reflected or stored XSS depending on how the input is handled, but the exact vector is not detailed. No public exploits have been reported yet, but the vulnerability is publicly disclosed and thus poses a risk of exploitation. The Booking.com Banner Creator is a tool used to generate promotional banners for Booking.com services, often embedded in third-party websites or partner platforms, increasing the attack surface. The lack of a CVSS score means severity must be estimated based on the nature of XSS vulnerabilities, which typically have high impact on confidentiality and integrity, moderate impact on availability, and are relatively easy to exploit without authentication or user interaction beyond visiting a malicious page. The vulnerability was reserved and published in October 2024, indicating recent discovery and disclosure. No patches or fixes are currently linked, so users must rely on mitigations until an official update is released.

The primary impact of CVE-2024-49265 is the compromise of user confidentiality and integrity through the execution of arbitrary scripts in the context of affected web pages. Attackers can steal session cookies, enabling account takeover, or capture sensitive user inputs such as login credentials. This can lead to unauthorized access to user accounts and sensitive data. Additionally, attackers can manipulate the content displayed to users, potentially defacing websites or redirecting users to malicious domains, which can damage organizational reputation and trust. For organizations relying on the Booking.com Banner Creator to embed promotional content, this vulnerability increases the risk of supply chain attacks where malicious actors exploit the banner to target end users. The absence of known exploits currently limits immediate widespread impact, but the public disclosure increases the risk of future exploitation. The vulnerability affects the availability of trust in the affected websites and may lead to compliance issues if user data is compromised. Overall, the threat is significant for organizations in the travel, hospitality, and affiliate marketing sectors that utilize this banner creator tool.

Organizations should immediately review their use of the Booking.com Banner Creator and restrict or disable banner content until a patch is available. Implement strict input validation and sanitization on all user-supplied data used in banner generation to prevent injection of malicious scripts. Employ output encoding techniques such as HTML entity encoding to neutralize potentially dangerous characters before rendering content in browsers. Use Content Security Policy (CSP) headers to restrict the execution of inline scripts and limit the sources from which scripts can be loaded, reducing the impact of potential XSS attacks. Monitor web traffic and logs for unusual activity that may indicate exploitation attempts. Educate developers and administrators about secure coding practices related to web content generation. Engage with SPBooking.com for updates and patches addressing this vulnerability. If possible, isolate or sandbox banner content to minimize the impact of any injected scripts. Finally, conduct regular security assessments and penetration testing focusing on web application input handling and output encoding.