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Sensitive Data Leak via Permissions Issue in Apple WebKit

IdentifiersCVE-2026-43713CWE-284

CVE-2026-43713 is a WebKit permissions flaw affecting Safari 26.5.2 prior versions, iOS 26.5.2 prior versions, iPadOS 26.5.2 prior versions, and macOS Tahoe 26.5.2 prior versions. Apple describes the issue as a permissions problem that was addressed with additional restrictions. Successful exploitation occurs when a user visits a malicious or crafted website, which may cause sensitive data to be leaked. The available advisory text does not identify the specific vulnerable function or subsystem beyond WebKit, but the issue is consistently characterized as insufficient permission restrictions during website processing.

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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.

A remote attacker operating a malicious website may be able to cause leakage of sensitive data from the victim's browsing context or related protected data handled by WebKit. Based on the available information, the primary impact is confidentiality loss rather than code execution or privilege escalation.

Mitigation

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

Until patches can be applied, reduce exposure by limiting use of untrusted websites and isolating web browsing activity on affected systems. Standard browser-hardening measures such as restricting access to sensitive browser features and minimizing browsing from high-value accounts may reduce risk, but no vendor-specific workaround beyond updating is provided in the available content.

Remediation

Patch, then assume compromise.

Apply Apple's fixes by upgrading to Safari 26.5.2, iOS 26.5.2, iPadOS 26.5.2, and macOS Tahoe 26.5.2, as applicable. Apple states the issue was resolved by adding additional restrictions to the affected permissions handling.
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.

ACTIVITY FEED

Recent activity

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

4 SOURCESView more in app
What this page doesn’t show

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Exposure mapping

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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 activity

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-43713
NVD
nvd.nist.gov/vuln/detail/CVE-2026-43713
MITRE CWE · CWE-284
cwe.mitre.org