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CVE-2026-43735 Apple CVE debrief

A vulnerability was addressed with improved checks in Apple products. This issue is fixed in Safari 26.5.2, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2, tvOS 26.6, visionOS 26.6, watchOS 26.6. A malicious website may exfiltrate data cross-origin. The vulnerability has a CVSS score of 8.1, indicating a HIGH severity level. Users of Apple products, particularly those using Safari, iOS, iPadOS, macOS, tvOS, visionOS, and watchOS, should apply the latest security updates to mitigate the risk of cross-origin data exfiltration.

Vendor
Apple
Product
Safari
CVSS
HIGH 8.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-29
Original CVE updated
2026-08-17
Advisory published
2026-06-29
Advisory updated
2026-08-17

Who should care

Users of Apple products, particularly those using Safari, iOS, iPadOS, macOS, tvOS, visionOS, and watchOS, should apply the latest security updates to mitigate the risk of cross-origin data exfiltration. This includes administrators and security teams responsible for maintaining these systems.

Technical summary

The vulnerability, addressed in various Apple products, could allow a malicious website to exfiltrate data cross-origin. The issue was fixed in Safari 26.5.2, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2, tvOS 26.6, visionOS 26.6, and watchOS 26.6. The CVSS score for this vulnerability is 8.1, indicating a HIGH severity level. This issue is related to improved checks in Apple products. Users of Apple products, particularly those using Safari, iOS, iPadOS, macOS, tvOS, visionOS, and watchOS, should apply the latest security updates to mitigate the risk of cross-origin data exfiltration. The vulnerability has a significant impact on the security of Apple products, and users should verify their systems and apply updates as necessary to prevent potential attacks.

Defensive priority

High

Recommended defensive actions

  • Apply the latest security updates for Safari, iOS, iPadOS, macOS, tvOS, visionOS, and watchOS.
  • Ensure that all Apple products are updated to the latest versions.
  • Monitor for any suspicious activity related to cross-origin data exfiltration.
  • Review compensating controls for exposed systems while remediation is scheduled and verified.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented.
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record was published on 2026-06-29T20:17:37.507Z and was last modified on 2026-07-27T21:16:58.257Z. The NVD entry is currently Modified. This issue is addressed in various Apple products, including Safari 26.5.2, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2, tvOS 26.6, visionOS 26.6, and watchOS 26.6. The CVSS score for this vulnerability is 8.1, indicating a HIGH severity level. Users should verify their systems and apply updates as necessary.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-43735 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-43735

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-43735 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-43735

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.