Arbitrary Code Execution in Apple JavaScriptCore (CVE-2022-48503)

Historical catalog analysis: CISA added this entry on October 20, 2025. The entry reflects catalog information retrieved on August 31, 2026, not a snapshot archived on the inclusion date. Check current vendor guidance before acting.

What the vulnerability is

CVE-2022-48503 is an unspecified vulnerability located within the JavaScriptCore component used across multiple Apple operating systems. When processing specially crafted web content, this flaw could allow for arbitrary code execution. This indicates a risk where an attacker may execute commands on a target system by inducing the user to interact with malicious web content.

Exposure and applicability

The vulnerability affects a broad range of Apple products, specifically those utilizing JavaScriptCore for web processing. Affected platforms include:
* macOS
* iOS
* tvOS
* watchOS
* Safari browser

Infrastructure owners should note that some affected versions may have reached end-of-life (EoL) or end-of-service (EoS) status, meaning vendor patches may no longer be available for those specific legacy assets.

Remediation priorities

Our analysis suggests prioritizing remediation based on the asset’s exposure to external web content and its support status. We recommend the following priority sequence:

1. Active Support Assets: For devices still receiving updates, apply vendor-provided mitigations immediately. These are the primary controls intended to prevent initial access.
2. Legacy/EoL Assets: Identify assets that are end-of-life or end-of-service. Because these may lack available patches, our analysis suggests discontinuing their utilization to eliminate the exposure path entirely.
3. High-Exposure Roles: Prioritize updates for devices used by personnel who frequently access diverse or untrusted web content, as this is the primary delivery vector for the vulnerability.

How to validate remediation

Verification must move beyond simple version checks to ensure that the risk has been reduced. Defenders should employ the following validation methods:

• Patch Verification: Confirm the successful deployment of vendor mitigations across all identified Apple assets via centralized management tools.
• Asset Decommissioning Audit: For EoL/EoS systems, verify through network discovery or inventory audits that these devices have been removed from the environment or disconnected from web-accessible networks.
• Configuration Review: Ensure that browser settings and security profiles are aligned with current vendor hardening guidance to limit the impact of potential JavaScript execution.

Limits and open questions

A significant residual risk remains for organizations utilizing legacy Apple hardware that cannot be updated. In these cases, no software patch can resolve the underlying vulnerability; only total removal or strict network isolation can reduce exposure. It remains unknown whether this vulnerability is currently being leveraged by ransomware campaigns. Furthermore, because the specific nature of the flaw in JavaScriptCore is listed as “unspecified,” defenders cannot create custom signatures to detect the exploit attempt itself and must rely on vendor mitigations.

Source and editorial note

CVE-2022-48503: Apple Multiple Products Unspecified Vulnerability · Source date: October 20, 2025 · Retrieved August 31, 2026.

Material facts are tied to the cited primary source. Recommendations are independent defensive analysis unless attributed to the source. Confirm consequential decisions against current authoritative guidance.

Archive date: October 23, 2025. The displayed post date is assigned three days after the source date to organize this retrospective archive; it does not mean this site published the analysis then. First published by this site: September 30, 2026 at 00:50 UTC.

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