CVE-2025-13025 is a vulnerability identified in Mozilla Firefox and Thunderbird prior to version 145, specifically within the Graphics: WebGPU component. The issue arises from incorrect boundary conditions, classified under CWE-276, which typically involves improper handling of limits or constraints in code logic. This flaw can be exploited remotely without any authentication or user interaction, as indicated by the CVSS vector (AV:N/AC:L/PR:N/UI:N). The vulnerability does not compromise confidentiality or availability but has a high impact on integrity, meaning an attacker could manipulate or corrupt data processed via the WebGPU interface. WebGPU is a modern graphics API designed to provide high-performance 3D graphics and computation capabilities in web browsers, making this vulnerability particularly relevant for applications relying on advanced graphics processing. Although no known exploits are currently reported in the wild, the absence of patches at the time of disclosure increases the risk window. The vulnerability's exploitation could allow attackers to execute unauthorized code paths or corrupt graphical computations, potentially undermining application logic or security controls dependent on WebGPU outputs. The vulnerability affects all Firefox and Thunderbird versions before 145, with no specific subversions detailed. The issue was publicly disclosed on November 11, 2025, and is assigned a CVSS v3.1 score of 7.5, categorizing it as high severity.

For European organizations, the primary impact of CVE-2025-13025 lies in the potential unauthorized modification of data integrity within applications using Firefox or Thunderbird that leverage WebGPU. This could affect sectors relying on secure and accurate graphical computations, such as design, engineering, finance, and government services. The vulnerability's remote exploitability without authentication or user interaction increases the risk of widespread attacks, especially in environments where Firefox is a primary browser or Thunderbird is used for email communication. Although confidentiality and availability are not directly impacted, integrity breaches can lead to data corruption, misrepresentation, or manipulation, which may result in financial loss, reputational damage, or regulatory non-compliance under GDPR. The lack of known exploits currently provides a limited window for proactive defense, but the high severity score underscores the urgency for mitigation. Organizations using Firefox or Thunderbird in critical infrastructure or sensitive environments are particularly at risk.

1. Immediately plan to upgrade Mozilla Firefox and Thunderbird to version 145 or later once official patches are released. 2. Until patches are available, consider disabling the WebGPU feature via browser configuration settings or enterprise policies to reduce the attack surface. 3. Monitor network and endpoint logs for unusual activity related to graphics processing or unexpected application behavior in Firefox or Thunderbird. 4. Employ application whitelisting and endpoint detection and response (EDR) tools to detect and block suspicious exploitation attempts targeting the WebGPU component. 5. Educate users about the importance of applying updates promptly and avoiding untrusted websites that might attempt to exploit browser vulnerabilities. 6. Coordinate with IT and security teams to prioritize patch management for browsers and email clients, especially in departments handling sensitive data or critical operations. 7. Review and tighten browser security policies, including sandboxing and content security policies, to limit the impact of potential exploits. 8. Engage with Mozilla security advisories and subscribe to vulnerability notifications to stay informed about patch releases and further technical details.