EUVD-2026-40219
GHSA-gc99-j9gc-r79x
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Network delivery via web content requires only passive user interaction; no privileges needed; high confidentiality impact from cross-origin data leakage; no integrity or availability impact.
Primary rating from Vendor (apple).
CVSS VectorVendor: apple
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Lifecycle Timeline
5DescriptionCVE.org
A cross-origin issue was addressed with improved tracking of security origins. This issue is fixed in Safari 26.5.2, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2. Processing maliciously crafted web content may disclose sensitive user information.
AnalysisAI
Cross-origin information disclosure in Apple Safari, iOS, iPadOS, and macOS Tahoe (all versions before 26.5.2) allows an attacker who can direct a user to maliciously crafted web content to read sensitive data from other origins, violating the Same-Origin Policy. The flaw stems from inadequate tracking of security origins in the WebKit engine (CWE-346), and is notable because on iOS and iPadOS all browsers are mandated to use WebKit, meaning every browser on those platforms is affected. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that a victim actively visit or be redirected to a maliciously crafted webpage using an unpatched version of Safari, or any browser on an unpatched iOS or iPadOS device (since all iOS/iPadOS browsers use WebKit). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 6.5 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N) reflects a network-reachable, low-complexity attack requiring no privileges and only passive user interaction - visiting a malicious page - with high confidentiality impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker registers or compromises a website and embeds crafted JavaScript or web content that exploits the cross-origin origin-tracking flaw. When a victim on an unpatched Safari, iOS, or iPadOS device visits the malicious page - via a phishing email, malvertising, or a compromised legitimate site - the attacker's content can read sensitive data (such as authentication tokens or page content) from other origins the user is concurrently logged into. … |
| Remediation | Apply the vendor-released patches immediately: update Safari to version 26.5.2 or later, iOS and iPadOS to version 26.5.2 or later, and macOS Tahoe to version 26.5.2 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-346 – Origin Validation Error
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External POC / Exploit Code
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