CVE-2026-16367 in Firefox
Summary
by MITRE • 07/21/2026
Sandbox escape due to invalid pointer in the Disability Access APIs component. This vulnerability was fixed in Firefox 153.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 07/21/2026
The vulnerability identified as a sandbox escape through invalid pointer handling within the Disability Access APIs component represents a critical security flaw that undermines the fundamental isolation mechanisms of modern web browsers. This type of vulnerability specifically targets the sandboxing architecture that separates browser processes to prevent malicious code from escaping and accessing sensitive system resources. The Disability Access APIs, designed to provide accessibility features for users with disabilities, inadvertently created a pathway for privilege escalation through improper memory management practices that allowed attackers to manipulate pointer references beyond their intended boundaries.
The technical implementation of this vulnerability stems from inadequate input validation and memory safety checks within the accessibility component's handling of user-provided data. When the browser processes accessibility requests or interacts with assistive technologies, the Disability Access APIs component fails to properly validate pointer references, creating opportunities for attackers to craft malicious inputs that cause the system to dereference invalid memory locations. This flaw operates at a low level within the browser's memory management system and can be exploited through carefully crafted web content or malicious documents that trigger the accessibility APIs with malformed data structures.
The operational impact of this sandbox escape vulnerability extends beyond simple privilege escalation to potentially enable complete system compromise when combined with other attack vectors. An attacker who successfully exploits this vulnerability gains access to the same privileges as the browser process, which typically includes read and write access to files within the user's browsing context, network communication capabilities, and in some cases direct access to underlying operating system resources. The implications are particularly severe for users running browsers on systems with elevated privileges or those using the browser for sensitive activities such as banking, corporate work, or handling confidential data.
This vulnerability aligns with several cybersecurity frameworks and threat modeling approaches including common weakness enumeration cwe 476 which describes null pointer dereference conditions, and attack techniques outlined in the mitre att&ck framework under privilege escalation and defense evasion categories. The flaw demonstrates how accessibility features, while essential for inclusive design, can inadvertently create security weaknesses when not properly implemented with security considerations in mind. Organizations should prioritize updating to Firefox version 153 or later where this vulnerability has been addressed through improved memory validation and pointer integrity checks within the Disability Access APIs component.
The mitigation strategy involves immediate deployment of the patched Firefox version along with monitoring for any indicators of exploitation attempts that might have occurred before the patch was released. Security teams should also consider implementing additional network-based detection measures to identify potential exploitation attempts targeting this specific vulnerability, particularly focusing on unusual memory access patterns or unexpected interactions with accessibility APIs in browser processes. Regular security assessments of browser components and their integration with system-level features should be conducted to prevent similar issues from emerging in other parts of the software ecosystem.
The resolution of this vulnerability demonstrates the importance of comprehensive security testing across all browser components, including those that might seem non-critical or specialized such as accessibility APIs. Modern browser security requires continuous vigilance in addressing edge cases and unexpected interaction patterns between different system components. The fix implemented in Firefox 153 likely involved strengthening memory validation procedures within the Disability Access APIs, implementing additional pointer integrity checks, and ensuring proper isolation boundaries that prevent unauthorized access to system resources even when malformed inputs are processed through accessibility interfaces.
Organizations should maintain updated threat intelligence feeds specifically focused on browser security vulnerabilities and their exploitation patterns. The incident highlights the need for security professionals to understand not just traditional attack vectors but also how seemingly benign features like accessibility support can become attack surfaces when not properly secured. Regular vulnerability assessments, code reviews focusing on memory safety, and adherence to secure coding practices across all software components including specialized features are essential for preventing similar vulnerabilities from emerging in future versions of browser software and other complex applications that rely on comprehensive system integration.