CVE-2026-43721Network attack vector

Clipboard-data disclosure via synthesized user activation

Published Jun 29, 2026 · Updated Jun 29, 2026

Improper authorization in Apple WebKit Storage before 26.5.2 allows remote attackers to read clipboard data through a malicious website. The requestStorageAccess() no-gesture rejection path preserves a nonexistent gesture and synthesizes user activation, letting a cross-site iframe invoke gesture-gated clipboard APIs from its catch handler. A user must visit the malicious site; no authentication is required, and the demonstrated consequence is clipboard-data disclosure.

CVSS severity6.5
Medium
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper authorization in Apple WebKit Storage before 26.5.2 allows remote attackers to read clipboard data through a malicious website. The requestStorageAccess() no-gesture rejection path preserves a nonexistent gesture and synthesizes user activation, letting a cross-site iframe invoke gesture-gated clipboard APIs from its catch handler. A user must visit the malicious site; no authentication is required, and the demonstrated consequence is clipboard-data disclosure.

The record

CVE
CVE-2026-43721
Published
Jun 29, 2026
Updated
Jun 29, 2026
Vendor
Apple
Product
iOS and iPadOS
Classifications
CWE-732, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <26.5.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · iOS and iPadOSversion=0 <26.5.2
Apple · Safariversion=0 <26.5.2
Apple · macOSversion=0 <26.5.2

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-732Incorrect Permission Assignment for Critical Resource
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo