ClearanceKit: Managed and user-defined policy rules not enforced between opfilter start and first policy modification

This vulnerability allows an attacker to bypass both MDM-delivered and user-defined file access policies within ClearanceKit. The bypass window exists during the application's startup phase, before user interaction triggers policy updates. An attacker could exploit this to gain unauthorized access to sensitive data protected by ClearanceKit's policies, potentially including documents, configuration files, or other critical system resources. The impact is particularly severe in environments where ClearanceKit is used to enforce strict data access controls, as this vulnerability effectively disables those controls during the initial startup period. While no specific real-world exploitation has been publicly reported, the potential for data exfiltration and privilege escalation makes this a significant security concern.

1. 已保留2026-03-26
2. 发布日期2026-03-31
3. 修改日期2026-04-02
4. EPSS 更新日期2026-04-08

The primary mitigation for CVE-2026-34218 is to upgrade ClearanceKit to version 4.2.14 or later. If an immediate upgrade is not feasible due to compatibility issues or system downtime constraints, consider temporarily disabling unnecessary file access policies within ClearanceKit to reduce the attack surface. While a direct workaround to prevent the startup bypass is not available, ensuring that user interaction occurs as quickly as possible after system startup can minimize the window of vulnerability. Monitor system logs for any unusual file access activity that might indicate exploitation attempts.