CVE-2026-43670: Processing maliciously crafted web content may bypass Content Security Policy in Apple Safari
Description
CVE-2026-43670 is a high-severity vulnerability in Apple Safari where processing maliciously crafted web content may bypass the Content Security Policy (CSP) specifically in AudioWorklet contexts. This issue could allow attackers to circumvent CSP protections, potentially leading to unauthorized code execution or data exposure. Apple addressed this vulnerability with improved enforcement in Safari 26.5, iOS 18.7.9, iPadOS 18.7.9, iOS 26.5, iPadOS 26.5, and macOS Tahoe 26.5.
CVSS v3.1
Score 8.8high
Affected software
Apple
Safari
Apple
iOS and iPadOS
Apple
macOS
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a Content Security Policy bypass in Apple Safari's AudioWorklet contexts. Maliciously crafted web content could exploit this flaw to bypass CSP restrictions, undermining the browser's security controls designed to prevent unauthorized resource loading or script execution. Apple fixed the issue by enhancing CSP enforcement in the specified Safari and OS versions.
Potential Impact
Successful exploitation of this vulnerability could allow attackers to bypass Content Security Policy protections, potentially leading to high impact including confidentiality, integrity, and availability violations. This could enable unauthorized script execution or data access within the browser context.
Mitigation Recommendations
Apple has released fixes for this vulnerability in Safari 26.5, iOS 18.7.9, iPadOS 18.7.9, iOS 26.5, iPadOS 26.5, and macOS Tahoe 26.5. Users and administrators should apply these updates to ensure protection against this CSP bypass. No additional mitigation steps are indicated beyond applying the official patches.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apple
- Date Reserved
- 2026-05-01T22:46:21.640Z
- State
- PUBLISHED
Threat ID: 6a8def07acd9273b49a0e1b7
Added to database: 08/25/2026, 19:37:43 UTC
Last enriched: 09/10/2026, 01:52:18 UTC
Last updated: 10/09/2026, 18:48:19 UTC
Views: 72
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