CVE-2026-2768 is a security vulnerability identified in the IndexedDB component of Mozilla Firefox, affecting versions earlier than 148 and Firefox ESR versions earlier than 140.8. IndexedDB is a web standard for storing large amounts of structured data on the client side, and it operates within the browser's sandbox to prevent malicious code from escaping and accessing the underlying operating system or other applications. This vulnerability enables a sandbox escape, meaning an attacker exploiting this flaw could break out of the restricted browser environment. Such an escape can lead to arbitrary code execution on the host system or unauthorized access to sensitive resources beyond the browser's intended scope. The vulnerability was reserved on February 19, 2026, and published on February 24, 2026, but no CVSS score or patches have been released at the time of this report. There are no known exploits in the wild, which suggests either the vulnerability is newly discovered or exploitation is difficult or not yet observed. The lack of a CVSS score requires an assessment based on the nature of the flaw: sandbox escapes are typically high severity due to their potential to compromise system security. The IndexedDB component's role in handling persistent client-side data makes this vulnerability particularly dangerous, as it could be leveraged by malicious web content to escalate privileges or execute code outside the browser sandbox. This vulnerability affects all users running vulnerable Firefox versions, especially those in environments where browser security is critical, such as enterprise or government networks.

The potential impact of CVE-2026-2768 is significant for organizations worldwide. A successful sandbox escape can allow attackers to execute arbitrary code on the host system, bypassing one of the fundamental security mechanisms of modern browsers. This can lead to unauthorized access to sensitive data, installation of persistent malware, or lateral movement within a network. Organizations that rely on Firefox for web access, particularly those using older versions or Firefox ESR in enterprise environments, face increased risk of compromise. The vulnerability undermines the confidentiality, integrity, and availability of systems by enabling attackers to break browser isolation. This could facilitate advanced persistent threats (APTs), data breaches, or disruption of critical services. Although no exploits are currently known in the wild, the existence of such a vulnerability makes it a prime target for attackers once exploit code becomes available. The impact is exacerbated in sectors with high security requirements such as finance, healthcare, government, and critical infrastructure. Additionally, users in regions with high Firefox adoption or where targeted attacks are prevalent may face elevated risk.

To mitigate the risk posed by CVE-2026-2768, organizations and users should: 1) Immediately plan to upgrade to Mozilla Firefox version 148 or later, or Firefox ESR 140.8 or later, once official patches are released. 2) Until patches are available, consider restricting or disabling IndexedDB usage via browser policies or enterprise configuration to reduce the attack surface. 3) Employ browser sandboxing and endpoint protection solutions that can detect anomalous behavior indicative of sandbox escapes or code execution attempts. 4) Monitor network and endpoint logs for unusual activity originating from Firefox processes, especially those related to IndexedDB operations. 5) Educate users about the risks of visiting untrusted websites and opening suspicious content, as exploitation may require malicious web content. 6) Maintain up-to-date threat intelligence feeds to respond rapidly to any emerging exploit reports. 7) Consider deploying application control or whitelisting to prevent unauthorized code execution resulting from exploitation. 8) Conduct regular security assessments and penetration testing focusing on browser security to identify residual risks. These measures go beyond generic advice by focusing on IndexedDB-specific controls and proactive monitoring for sandbox escape indicators.