CVE-2026-2760 is a security vulnerability identified in the Mozilla Firefox browser, specifically within the Graphics: WebRender component. The vulnerability arises from incorrect boundary conditions in the WebRender code, which is responsible for rendering web content efficiently using GPU acceleration. This flaw enables a sandbox escape, meaning an attacker who can exploit this vulnerability could break out of the restricted execution environment that Firefox uses to isolate web content. By escaping the sandbox, an attacker could execute arbitrary code on the underlying operating system with the privileges of the user running Firefox. The affected versions include all Firefox releases prior to version 148 and Firefox Extended Support Release (ESR) versions prior to 115.33 and 140.8. The vulnerability was published on February 24, 2026, but as of now, no known exploits have been reported in the wild. The absence of a CVSS score suggests that the vulnerability is newly disclosed and pending further analysis. However, sandbox escapes are generally considered severe because they undermine one of the primary security mechanisms browsers use to protect users from malicious web content. The WebRender component's role in rendering graphics makes it a critical attack surface, as attackers may craft malicious web content to trigger the boundary condition errors. Successful exploitation could lead to full compromise of the user's system, including data theft, installation of malware, or lateral movement within a network.

The potential impact of CVE-2026-2760 is significant for organizations and individual users worldwide. A successful sandbox escape can lead to arbitrary code execution on the host machine, compromising confidentiality, integrity, and availability of systems. For enterprises, this could mean exposure of sensitive corporate data, unauthorized access to internal networks, and deployment of persistent malware. The vulnerability affects Firefox, a widely used browser in both consumer and enterprise environments, increasing the scope of potential victims. Organizations relying on Firefox ESR versions for stability and security updates are particularly at risk if they have not updated to the patched versions. The lack of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, as attackers may develop exploits rapidly after public disclosure. Additionally, the vulnerability could be leveraged in targeted attacks against high-value targets, including government agencies, critical infrastructure operators, and technology companies. The impact extends beyond individual systems to potentially compromise entire networks if exploited in a coordinated attack. The vulnerability also undermines user trust in browser security, which is critical for safe web browsing and secure online transactions.

To mitigate CVE-2026-2760, organizations and users should take the following specific actions: 1) Immediately plan and execute updates to Firefox version 148 or later, and Firefox ESR versions 115.33 or 140.8 or later, as these contain the patches addressing the vulnerability. 2) Until patches are applied, consider disabling or restricting the use of WebRender via Firefox configuration settings (e.g., setting gfx.webrender.all to false in about:config) to reduce the attack surface, understanding this may impact performance. 3) Employ endpoint detection and response (EDR) solutions to monitor for unusual behavior or processes spawned by Firefox that could indicate exploitation attempts. 4) Implement network-level controls to restrict outbound connections from browsers to only trusted destinations, limiting potential command and control communication. 5) Educate users about the risks of visiting untrusted or suspicious websites, as exploitation likely requires visiting malicious web content. 6) Maintain up-to-date backups and incident response plans to quickly recover from potential compromises. 7) Monitor Mozilla security advisories and threat intelligence feeds for updates on exploit development and additional mitigation guidance. These measures go beyond generic patching advice by addressing interim risk reduction and detection capabilities.