CVE-2026-84577 in macOS
Summary
by MITRE • 09/15/2026
An access issue was addressed with additional sandbox restrictions. This issue is fixed in macOS Golden Gate 27, macOS Tahoe 26.7. An app may be able to bypass sandbox restrictions.
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Analysis
by VulDB Data Team • 09/15/2026
The vulnerability described involves a flaw in the operating system's application sandboxing mechanism, specifically within the versions identified as macOS Golden Gate 27 and macOS Tahoe 26.7. The core technical issue stems from an access control failure where the enforcement logic governing isolated execution environments for applications contains gaps that allow unauthorized privilege escalation or data exfiltration beyond the intended boundaries. Sandbox restrictions are a critical security feature designed to limit the damage a compromised application can cause by restricting its access to system resources, user files, and other processes. When these restrictions are bypassed, an untrusted app gains capabilities equivalent to those of a trusted process operating within the same context, effectively neutralizing one of the primary defense-in-depth layers provided by modern mobile and desktop operating systems.
From a technical perspective, this type of vulnerability typically arises from improper validation of resource access requests or race conditions in the kernel-level enforcement mechanisms that manage sandbox profiles. An attacker could exploit this flaw to read sensitive user data such as documents, photos, or credentials stored outside the app's designated container directory. Furthermore, bypassing sandbox restrictions may allow malicious code to interact with other applications, inject code into privileged processes, or access network interfaces without proper authorization checks. This undermines the principle of least privilege and compromises the integrity of the system by allowing a single compromised application to act as a pivot point for further lateral movement within the user environment.
The operational impact of this vulnerability is significant because it erodes trust in the security model that protects users from malicious or poorly coded software. If an app can bypass sandbox restrictions, it can exfiltrate personal information without detection by standard monitoring tools that rely on these boundaries to flag anomalous behavior. This poses a direct risk to user privacy and data confidentiality. In enterprise environments, this could lead to the compromise of corporate secrets if employees use vulnerable applications to access sensitive organizational resources from their local devices. The lack of effective isolation means that malware or adware installed inadvertently by users can operate with elevated privileges, leading to potential system instability, unauthorized changes to system configurations, and persistent backdoors.
Mitigation strategies primarily involve applying the vendor-provided software updates immediately upon release for macOS Golden Gate 27 and macOS Tahoe 26.7. These patches address the underlying code flaws that permitted the bypass of sandbox restrictions. Administrators should ensure automated update mechanisms are enabled to reduce the window of exposure. Additionally, users can employ defense-in-depth measures such as enabling strict application control policies through endpoint detection and response solutions that monitor for unusual process behavior indicative of sandbox escapes. Restricting app installation sources to verified developers only reduces the likelihood of encountering malicious software capable of exploiting this flaw. Regular auditing of installed applications and monitoring system logs for anomalies related to access violations can also help in early detection of exploitation attempts before significant damage occurs.
This vulnerability aligns with Common Weakness Enumeration category CWE-250, which refers to execution with unnecessary privileges, as the app gains capabilities beyond its intended scope due to failed enforcement of restrictions. It is also relevant to MITRE ATT&CK technique T1608, specifically related to sandbox escape or evasion techniques where attackers exploit flaws in containerization or isolation mechanisms to gain broader access to the host system. Understanding these classifications helps security teams prioritize remediation efforts and align their detection rules with known adversary behaviors associated with privilege escalation via environment manipulation.