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Apple WebKit CVE-2026-28907

| EUVDEUVD-2026-29232 HIGH
Improper Input Validation (CWE-20)
2026-05-11 apple GHSA-gcfw-ghg9-2x22
Apple Information Disclosure Ios And Ipados Tvos Visionos Watchos
8.1
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
8.1 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
SUSE
HIGH
qualitative
Red Hat
6.5 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

5
Analysis Generated
Jun 08, 2026 - 10:31 vuln.today
CVSS changed
May 13, 2026 - 19:22 NVD
8.1 (HIGH)
Patch available
May 11, 2026 - 22:03 EUVD
CVE Published
May 11, 2026 - 20:08 nvd
UNKNOWN (no severity yet)
CVE Published
May 11, 2026 - 20:08 nvd
HIGH 8.1

DescriptionCVE.org

The issue was addressed with improved input validation. 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, tvOS 26.5, visionOS 26.5, watchOS 26.5. Processing maliciously crafted web content may prevent Content Security Policy from being enforced.

AnalysisAI

Content Security Policy bypass in Apple's WebKit-based platforms (iOS, iPadOS, macOS Tahoe, tvOS, visionOS, watchOS) allows maliciously crafted web content to evade CSP enforcement, undermining a core browser defense against XSS and data exfiltration. Apple addressed the input validation flaw across its product line in coordinated June 2026 updates. No public exploit is identified at time of analysis and EPSS is very low (0.03%), but the cross-platform reach and high CIA impact via user interaction make patching a priority.

Technical ContextAI

The vulnerability is rooted in CWE-20 (Improper Input Validation) within the web content processing pipeline shared across Apple operating systems - almost certainly WebKit, which renders web content on iOS, iPadOS, macOS, tvOS, visionOS, and watchOS. Content Security Policy is a browser-enforced declarative defense (delivered via the Content-Security-Policy HTTP header or meta tag) that constrains which scripts, stylesheets, frames, and connections a page may load. By malforming web content in a way the parser fails to validate properly, an attacker can cause the engine to either misparse the CSP directive or treat normally-blocked resources as policy-compliant, neutralizing protection against XSS, clickjacking, and unauthorized resource loading.

RemediationAI

Apply the vendor-released patches: upgrade to iOS/iPadOS 18.7.9 or 26.5, macOS Tahoe 26.5, tvOS 26.5, visionOS 26.5, or watchOS 26.5, referencing the Apple security advisories at support.apple.com/en-us/127110 through 127121 for the platform-specific build numbers. No vendor workaround is published; as a compensating control until devices are patched, restrict browsing of untrusted web content on managed devices via MDM web content filtering or by requiring traffic through a security web gateway that enforces CSP at the proxy layer - note this does not stop attacker-controlled content from being rendered, only reduces exposure. Discourage use of Safari for sensitive web apps on unpatched devices and prefer apps that do not rely on CSP as their sole client-side defense; this trades user convenience for reduced attack surface.

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Vendor StatusVendor

SUSE

Severity: High
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Basesystem 15 SP7 Fixed
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Fixed
SUSE Linux Enterprise Module for Development Tools 15 SP7 Fixed

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CVE-2026-28907 vulnerability details – vuln.today
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