Apple Safari/iOS/iPadOS/macOS/tvOS/visionOS/watchOS up to 26.3 Web ui layer

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.3$5k-$25k0.33

Summaryinfo

A vulnerability was found in Apple Safari, iOS, iPadOS, macOS, tvOS, visionOS and watchOS up to 26.3. It has been declared as problematic. This affects an unknown part of the component Web Handler. Such manipulation leads to ui layer. This vulnerability is traded as CVE-2026-20665. The attack may be launched remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Apple Safari, iOS, iPadOS, macOS, tvOS, visionOS and watchOS up to 26.3 and classified as problematic. Affected by this issue is some unknown processing of the component Web Handler. The manipulation with an unknown input leads to a ui layer vulnerability. Using CWE to declare the problem leads to CWE-1021. The web application does not restrict or incorrectly restricts frame objects or UI layers that belong to another application or domain, which can lead to user confusion about which interface the user is interacting with. Impacted is integrity. CVE summarizes:

This issue was addressed through improved state management. This issue is fixed in Safari 26.4, iOS 18.7.7 and iPadOS 18.7.7, iOS 26.4 and iPadOS 26.4, macOS Tahoe 26.4, tvOS 26.4, visionOS 26.4, watchOS 26.4. Processing maliciously crafted web content may prevent Content Security Policy from being enforced.

The advisory is shared for download at support.apple.com. This vulnerability is handled as CVE-2026-20665 since 11/11/2025. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 03/30/2026).

Upgrading to version 26.4 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-0911). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Open Source WebKitGTK

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

ADP CISA Base Score: 6.5
ADP CISA Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Ui layer
CWE: CWE-1021
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Safari/iOS/iPadOS/macOS/tvOS/visionOS/watchOS 26.4

Timelineinfo

11/11/2025 CVE reserved
03/25/2026 +134 days Advisory disclosed
03/25/2026 +0 days VulDB entry created
03/30/2026 +5 days VulDB entry last update

Sourcesinfo

Vendor: apple.com

Advisory: support.apple.com
Status: Confirmed

CVE: CVE-2026-20665 (🔒)
GCVE (CVE): GCVE-0-2026-20665
GCVE (VulDB): GCVE-100-352904
CERT Bund: WID-SEC-2026-0911 - WebKitGTK: Mehrere Schwachstellen

scip Labs: https://www.scip.ch/en/?labs.20180712

Entryinfo

Created: 03/25/2026 07:29
Updated: 03/30/2026 14:27
Changes: 03/25/2026 07:29 (57), 03/29/2026 16:46 (12), 03/30/2026 14:27 (7)
Complete: 🔍
Cache ID: 216:D39:103

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