Medium

Safari Web Extensions User Tracking Privacy Issue

IdentifiersCVE-2026-20676CWE-359

CVE-2026-20676 is a WebKit privacy vulnerability in which a website may be able to track users through Safari web extensions. Apple states the issue was addressed through improved state management and references WebKit Bugzilla 305020. The flaw affects Apple platforms shipping the vulnerable WebKit/Safari code, and WebKitGTK and WPE WebKit before 2.50.6 are also listed as affected in downstream advisories. Based on the available vendor language, the issue is a privacy/state-isolation weakness rather than a memory-safety bug, allowing web content to infer or leverage extension-related state in a way that enables cross-site or persistent user tracking.

For your environment

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation enables privacy compromise through user tracking. A malicious website could use Safari web extensions as a tracking vector, potentially allowing correlation of browsing activity or persistent identification of users beyond expected browser privacy boundaries. The available information does not indicate code execution, privilege escalation, or direct memory corruption impact for this CVE.

Mitigation

If you can’t patch tonight, do this now.

If patching cannot be performed immediately, reduce exposure by disabling Safari web extensions, minimizing installed/enabled extensions, and limiting browsing to trusted sites where feasible. In managed environments, restrict extension installation and use policy controls to allow only necessary, trusted extensions until fixed builds are deployed.

Remediation

Patch, then assume compromise.

Apply the vendor fixes in Safari 26.3, iOS 26.3, iPadOS 26.3, macOS Tahoe 26.3, and visionOS 26.3. For WebKitGTK and WPE WebKit, update to version 2.50.6 or later. Apple states the issue was fixed through improved state management.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

AppleIpadosoperating_system

AppleIphone Osoperating_system

AppleMacosoperating_system

AppleSafariapplication

AppleVisionosoperating_system

Rocky LinuxRocky Linuxoperating_system

WebkitgtkWebkit2gtk3application

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

12 SOURCESView more in app

handlers diary fullNews

Feb 11, 2026

Apple Patches Everything: February 2026 - SANS ISC

WebKit/Safari extensions tracking issue enabling cross-site user tracking.

apple supportNews

Feb 11, 2026

About the security content of iOS 26.3 and iPadOS 26.3 - Apple Support

Web content processing crash (DoS) due to memory handling issue; fixed with improved memory handling.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity6