CVE-2024-44309 is a cross-site scripting (XSS) vulnerability in Apple Multiple Products. CISA added it to the Known Exploited Vulnerabilities catalogue on 21 November 2024, which means attackers have used it in real attacks. Apple iOS, macOS, and other Apple products contain an unspecified vulnerability when processing maliciously crafted web content that may lead to a cross-site scripting (XSS) attack.
What this vulnerability means in Apple products
CVE-2024-44309 is an XSS issue in Apple’s web-content handling path. That matters because malformed or malicious web content can execute in a user’s browser context inside affected Apple products, which turns ordinary page rendering into a trust boundary problem.
XSS is dangerous when a product processes untrusted web content because attacker-controlled script can ride on the trust that the browser gives to a legitimate site or app page. In practice, that can reshape what the user sees, alter page behavior, or interfere with interactions that the user assumes are safe.
How exposure is usually checked
The first question is whether you run the affected Apple products and whether users are exposed to the vulnerable web-content path. That usually means checking asset inventory, OS and device coverage, browser and embedded-web usage, and any vendor advisories that map the CVE to specific product lines or releases.
Because CISA placed the issue in the KEV catalogue, the vulnerability should be treated as known to be exploited, not merely theoretical. For version and patch details, use the CVE Program record and the NIST National Vulnerability Database entry alongside Apple’s own security advisory.
Exposure is highest where devices routinely render untrusted links, previews, embedded content, or in-app web views. If those surfaces are common in your fleet, the practical exposure is broader than a single browser setting because the vulnerable parsing path may be reused across products.
Why this kind of XSS is security-relevant
XSS is not just a page glitch. It can be used to mislead users, trigger unauthorized actions in a trusted session, or steal information visible in the browser context. Even when the payload is limited by sandboxing or browser protections, the attacker may still gain leverage over the user’s session and the data the user can reach.
For Apple endpoints, the security concern is the combination of user trust and broad web exposure. Attackers do not need direct system access if they can get malicious content rendered through a trusted app or page path that the user already interacts with.
Remediation and validation after patching
The immediate priority is to apply Apple’s fixed releases as soon as operationally possible, then verify that every internet-facing and user-facing Apple device is covered. Where patching is delayed, reduce exposure by limiting untrusted web content, restricting risky browsing patterns, and tightening enterprise browser and MDM policy where you can.
Use the vulnerability as a prompt to review whether sessions, cookies, saved credentials, or other browser-resident data could have been exposed during exploitation. If you find signs of compromise, reset the relevant accounts and invalidate the affected sessions or tokens rather than assuming the patch alone ends the incident.
For broader remediation discipline, the Vulnerability Management Guide is useful for prioritisation, and the Web Application Attacks Guide gives deeper context on XSS patterns and defensive controls.
Risk and Threat Considerations
This CVE is materially important because it is already known to be exploited and it affects products that routinely process attacker-supplied web content. That combination makes it suitable for opportunistic exploitation, especially against users who browse untrusted content or rely on embedded web views in everyday workflows.
Failure mechanism: The attacker supplies crafted web content that reaches the vulnerable rendering or parsing path, then uses script execution in the trusted browser context to influence user interaction or access browser-resident data.
Impact: The result can include session abuse, credential exposure, unauthorized actions in the user context, and follow-on compromise of accounts or services that the user can reach.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP ASVS, NIST SP 800-53 Rev 5 and CIS Controls v8 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP ASVS | V1 — Encoding and Sanitization | XSS is fundamentally an input handling and output encoding failure. |
| V16 — Security Logging and Error Handling | Post-exploitation review for XSS depends on usable logs and alerts. | |
| Recommendation — Apply V1 controls to encode untrusted content before it reaches the browser. Instrument V16 logging to detect anomalous web-content execution and session abuse. | ||
| NIST SP 800-53 Rev 5 | SI-10 — Information Input Validation | Cross-site scripting is prevented by validating and constraining untrusted input. |
| AU-6 — Audit Review, Analysis, and Reporting | Reviewing potential exploitation requires logs that can be analyzed quickly. | |
| Recommendation — Enforce SI-10 to reject or neutralize malicious web content before rendering. Use AU-6 to review browser and application activity after suspected exploitation. | ||
| CIS Controls v8 | 16 — Application Software Security | XSS is an application-layer weakness addressed through secure design and testing. |
| Recommendation — Use CIS-16 to identify and remediate application paths that render untrusted content. | ||
Practitioner Guidance
Why practitioners should care: Treat this as a user-exposure problem, not only a software-quality issue. If Apple devices are allowed to render arbitrary web content, the practical blast radius includes the users, sessions, and business systems those devices can reach.
What to watch for: Look for unusual browser behavior, unexpected redirects, content injection, or account activity that appears after users interact with hostile links or embedded content. Those are the kinds of signals that should trigger compromise review, not just routine patch confirmation.
Practitioner takeaway: Patch first, then assume any exposed session or browser-accessible secret may need review if exploitation is plausible.