EUVD-2026-40201
GHSA-3555-mvv3-v5xj
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Network-delivered via malicious site requiring victim to actively visit (UI:R), no privileges needed, limited to partial confidentiality loss with 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:L/I:N/A:N
Lifecycle Timeline
5DescriptionCVE.org
The issue was addressed with improved input validation. This issue is fixed in Safari 26.5.2, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2. A malicious website may exfiltrate data cross-origin.
AnalysisAI
Cross-origin data exfiltration in Apple Safari, iOS/iPadOS, and macOS Tahoe (all versions prior to 26.5.2) allows a malicious website to read data belonging to a different origin due to insufficient input validation. The CVSS vector (AV:N/AC:L/PR:N/UI:R) confirms the attack is network-delivered without authentication, requiring only that the victim visits an attacker-controlled page. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must be using Apple Safari, iOS/iPadOS built-in browser, or any Safari-based browser on macOS Tahoe, all at versions prior to 26.5.2. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 4.3 (Medium) with AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker registers a malicious domain and distributes a link via phishing email or malicious advertisement. When a victim on an unpatched Apple device visits the page in Safari, the page submits crafted input that bypasses Safari's origin validation logic, allowing the attacker's JavaScript to read a response or resource from a cross-origin target the victim's browser has access to - such as an authenticated internal page or session-scoped API response. … |
| Remediation | The primary fix is to update to Safari 26.5.2, iOS 26.5.2 and iPadOS 26.5.2, or macOS Tahoe 26.5.2, all of which contain vendor-released patches per Apple's advisories at https://support.apple.com/en-us/127594, https://support.apple.com/en-us/127595, and https://support.apple.com/en-us/127685. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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