CVE-2026-11970 Overview
CVE-2026-11970 is a security control bypass affecting Forcepoint One Endpoint (F1E) on macOS. A local non-administrative user can disable the F1E SafariExtension and circumvent Data Loss Prevention (DLP) enforcement. The flaw is categorized under CWE-754: Improper Check for Unusual or Exceptional Conditions. Forcepoint addressed the issue in F1E for macOS version 26.04.5758 and later.
Critical Impact
A standard user account can disable the Safari-based DLP inspection component, allowing sensitive data to leave the endpoint through Safari without policy enforcement.
Affected Products
- Forcepoint One Endpoint (F1E) for macOS prior to version 26.04.5758
- F1E SafariExtension component responsible for DLP enforcement in Safari
- macOS endpoints where F1E is deployed for DLP coverage
Discovery Timeline
- 2026-08-13 - CVE-2026-11970 published to the National Vulnerability Database
- 2026-08-13 - Last updated in NVD database
Technical Details for CVE-2026-11970
Vulnerability Analysis
The vulnerability resides in the F1E SafariExtension component on macOS. Forcepoint One Endpoint uses this extension to intercept web activity inside Safari and enforce DLP policy on uploads, downloads, and clipboard operations. The extension is expected to remain enabled and protected against tampering by non-privileged users. Because the product fails to properly check exceptional conditions around extension state, a normal user session can toggle the extension off without triggering an enforcement failure or reverting the change.
Once the extension is disabled, Safari traffic bypasses DLP inspection. Users can then upload or exfiltrate regulated data through Safari without policy triggers. The vulnerability does not require administrative privileges, network access, or user interaction beyond the local session.
Root Cause
The root cause maps to [CWE-754], improper handling of unusual or exceptional conditions. The F1E agent does not adequately validate or restore the enabled state of the Safari extension when a low-privileged user modifies it through supported macOS mechanisms. The agent should enforce persistence of the extension or fail closed when it detects the component is disabled.
Attack Vector
Exploitation is local and requires an authenticated non-admin session on the affected macOS host. An attacker with insider access, or malware running under a user account, disables the F1E SafariExtension through macOS extension management interfaces. After the extension is disabled, Safari operates outside DLP visibility, allowing sensitive files or data to be transmitted to attacker-controlled destinations. Refer to the Forcepoint Security Advisory for vendor-specific technical detail.
Detection Methods for CVE-2026-11970
Indicators of Compromise
- F1E SafariExtension reported as disabled or missing on managed macOS endpoints running versions earlier than 26.04.5758.
- Safari network activity involving sensitive file uploads without corresponding F1E DLP inspection events.
- Gaps in DLP telemetry from macOS endpoints where the F1E agent otherwise appears healthy.
Detection Strategies
- Correlate F1E agent health telemetry with Safari extension state to identify endpoints where the extension is unexpectedly disabled.
- Alert on macOS system events that toggle the state of Safari extensions associated with F1E under non-administrative user contexts.
- Compare DLP event volume per endpoint against baseline to surface systems producing anomalously low inspection counts.
Monitoring Recommendations
- Ingest F1E agent status and Safari extension enablement data into your SIEM for continuous validation.
- Monitor endpoint configuration drift on macOS fleets, focusing on browser extension state and DLP agent components.
- Track outbound web upload activity from Safari and cross-reference with DLP policy hits to detect enforcement gaps.
How to Mitigate CVE-2026-11970
Immediate Actions Required
- Upgrade all Forcepoint One Endpoint macOS installations to version 26.04.5758 or later.
- Inventory macOS endpoints running F1E and prioritize systems with access to regulated data.
- Validate that the F1E SafariExtension is enabled and reporting after the upgrade completes.
Patch Information
Forcepoint has released a fixed build of F1E for macOS at version 26.04.5758. Administrators should deploy the update through their standard F1E management workflow. Full remediation guidance is documented in the Forcepoint Security Advisory.
Workarounds
- Restrict local user privileges on macOS endpoints to reduce the population of accounts able to modify extension state.
- Deploy macOS configuration profiles via MDM to manage Safari extension policies where supported.
- Increase DLP monitoring at network egress points to compensate for potential endpoint enforcement gaps until patching completes.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
