CVE-2025-24704 is a stored cross-site scripting (XSS) vulnerability identified in the grimdonkey Magic the Gathering Card Tooltips plugin, specifically affecting versions up to and including 3.4.0. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, which allows attackers to inject malicious JavaScript code that is stored persistently within the application. When other users access the affected pages, the malicious script executes in their browsers under the context of the vulnerable site. This can lead to a range of attacks including session hijacking, theft of sensitive information such as cookies or credentials, defacement, or unauthorized actions performed on behalf of the victim user. The plugin is commonly used to enhance user experience by providing tooltips for Magic the Gathering cards on websites, making it a target for attackers seeking to exploit communities centered around this popular trading card game. Although no public exploits have been reported yet, the nature of stored XSS makes it a critical concern because the payload persists and affects multiple users. The vulnerability does not require user authentication to exploit, increasing its risk profile. No official patches or fixes are currently linked, indicating that users should be vigilant and consider temporary mitigations. The absence of a CVSS score necessitates an expert severity assessment based on impact and exploitability factors.

The impact of CVE-2025-24704 can be significant for organizations operating websites that use the grimdonkey Magic the Gathering Card Tooltips plugin. Stored XSS vulnerabilities allow attackers to execute arbitrary JavaScript in the context of the victim's browser session, potentially leading to session hijacking, theft of authentication tokens, redirection to malicious sites, or unauthorized actions performed with the victim's privileges. This can compromise user confidentiality and integrity, damage organizational reputation, and result in loss of user trust. For community-driven or e-commerce platforms related to Magic the Gathering, such an attack could disrupt user engagement and lead to financial losses. Since the vulnerability does not require authentication and can be triggered simply by visiting a compromised page, the attack surface is broad. Additionally, the persistence of the malicious payload means multiple users can be affected over time until the vulnerability is remediated. Organizations may also face compliance risks if user data is compromised due to this vulnerability.

To mitigate CVE-2025-24704, organizations should prioritize the following actions: 1) Monitor grimdonkey’s official channels for patches or updates addressing this vulnerability and apply them promptly once available. 2) Implement strict input validation on all user-supplied data to ensure that malicious scripts cannot be injected. This includes sanitizing inputs to remove or encode HTML special characters before storage or rendering. 3) Apply context-aware output encoding when displaying user-generated content, especially within HTML, JavaScript, or attribute contexts, to prevent script execution. 4) Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of XSS attacks. 5) Conduct regular security audits and penetration testing focused on XSS vulnerabilities in web applications using this plugin. 6) Educate site administrators and developers about secure coding practices related to input handling and output encoding. 7) As an interim measure, consider disabling or removing the Magic the Gathering Card Tooltips plugin if immediate patching is not feasible, especially on high-traffic or sensitive sites.