What is the CVSS score of EUVD-2026-29266?

EUVD-2026-29266 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.0%.

Which versions of WebKit are affected by EUVD-2026-29266?

Apple WebKit in Safari and in-app browsers across iOS, iPadOS, macOS, and visionOS contains an information disclosure vulnerability (CVE-2026-28962) that allows remote attackers to extract sensitive…. A patch is available.

How to fix or mitigate EUVD-2026-29266?

Within 24 hours: Audit inventory of devices running iOS/iPadOS, macOS, and visionOS to identify affected versions and prioritize business-critical systems. Within 7 days: Deploy vendor-released patches-iOS/iPadOS 18.7.9, iOS/iPadOS 26.5, macOS Tahoe 26.5, and visionOS 26.5-to at least 50% of fleet, prioritizing devices accessing sensitive corporate or user data. Within 30 days: Complete patching of 100% of affected devices; update mobile device management (MDM) policies to enforce minimum OS versions and restrict in-app browser usage if necessary pending full remediation.

WebKit EUVD-2026-29266

| CVE-2026-28962 HIGH

Information Exposure (CWE-200)

2026-05-11 apple

GHSA-qj7c-h383-wq37

Apple Information Disclosure

7.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

May 12, 2026 - 14:27 vuln.today

CVSS changed

May 12, 2026 - 14:22 NVD

7.5 (HIGH)

Patch available

May 11, 2026 - 22:18 EUVD

CVE Published

May 11, 2026 - 20:07 nvd

UNKNOWN (no severity yet)

CVE Published

May 11, 2026 - 20:07 nvd

HIGH 7.5

DescriptionCVE.org

This issue was addressed with improved access restrictions. This issue is fixed in iOS 18.7.9 and iPadOS 18.7.9, iOS 26.5 and iPadOS 26.5, macOS Tahoe 26.5, visionOS 26.5. Processing maliciously crafted web content may disclose sensitive user information.

AnalysisAI

Information disclosure in Apple WebKit allows remote attackers to extract sensitive user data by serving maliciously crafted web content to Safari or in-app browsers across iOS, iPadOS, macOS, and visionOS. Fixed in iOS/iPadOS 18.7.9, iOS/iPadOS 26.5, macOS Tahoe 26.5, and visionOS 26.5. Despite high CVSS 7.5, EPSS score of 0.02% (5th percentile) indicates minimal observed exploitation attempts in the wild. No CISA KEV listing and no public exploit code identified at time of analysis. Apple characterizes this as an access restriction flaw (CWE-200), suggesting the vulnerability bypasses same-origin policy or other browser security boundaries to leak data cross-domain.

Technical ContextAI

This is a WebKit browser engine vulnerability affecting Apple's rendering engine used across all its operating systems. CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) indicates inadequate access controls allowed web content to bypass isolation boundaries. WebKit implements critical security boundaries including same-origin policy, site isolation, and content security policies. The CVSS vector's Confidentiality impact of 'None' contradicts the description mentioning sensitive information disclosure-this discrepancy likely stems from initial scoring error, as information disclosure vulnerabilities typically have C:H (high confidentiality impact). The vulnerability resides in web content processing logic where crafted HTML, JavaScript, CSS, or embedded resources could trigger unauthorized data access. Affected CPE strings confirm impact across cpe:2.3:a:apple:ios_and_ipados, cpe:2.3:a:apple:macos, and cpe:2.3:a:apple:visionos, specifically WebKit components integrated into Safari and WKWebView frameworks used by third-party applications.

RemediationAI

Update immediately to vendor-released patched versions: iOS/iPadOS 18.7.9 for devices on the 18.x branch, iOS/iPadOS 26.5 for newer devices, macOS Tahoe 26.5, and visionOS 26.5. Patches available through standard Apple Software Update mechanisms (Settings > General > Software Update on iOS/iPadOS, System Settings > General > Software Update on macOS). Apple characterizes the fix as 'improved access restrictions' suggesting enhanced isolation between web content contexts. Organizations unable to patch immediately should implement compensating controls: disable JavaScript in Safari (Settings > Safari > Advanced > JavaScript off) which breaks most website functionality but prevents script-based exploitation, restrict web browsing to trusted domains only via mobile device management profiles or network filtering, or deploy web isolation technologies that render untrusted content in remote sandboxed environments. JavaScript disabling significantly impacts usability and should only be temporary. No evidence suggests private browsing mode or content blockers mitigate this specific WebKit engine flaw.