# CVE-2026-43735: Apple Safari and OS cross-origin data exfiltration

Source: https://junglewise.ai/threats/cve-2026-43735-apple-safari-and-os-cross-origin-data-exfiltration  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-29. Updated: 2026-06-29  
License: CC BY 4.0 with a link back

CVE-2026-43735 · Severity: info · CVSS 0 · Published 2026-06-29

A vulnerability in Apple's Safari browser and operating systems could allow a malicious website to steal data from other websites you have open. This could lead to the unauthorized exposure of sensitive personal or account information. Users should update their Apple devices to the latest software versions to protect their data.

Technologies: [Apple iPadOS](https://junglewise.ai/threats/technologies/ipados), [Apple macOS Tahoe](https://junglewise.ai/threats/technologies/macos), [Apple Safari](https://junglewise.ai/threats/technologies/safari). Vendors: [Apple](https://junglewise.ai/threats/vendors/apple).

## Quick answers

**Is CVE-2026-43735 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-43735 being exploited in the wild.

**How severe is CVE-2026-43735?** Informational severity, with a CVSS score of 0, published 29 June 2026.

**Which products and versions are affected?** Apple iPadOS before 26.5.2; Apple macOS Tahoe before 26.5.2; Apple Safari before 26.5.2.

**Is there a fix for CVE-2026-43735?** A patch was published on 2026-06-29. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-43735 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-43735?** Check whether you run Apple iPadOS, Apple macOS Tahoe or Apple Safari at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A cross-origin data exfiltration vulnerability exists in Apple Safari and multiple Apple operating systems. The flaw allows a malicious website to bypass Same-Origin Policy (SOP) protections and exfiltrate data from other origins. The issue was caused by insufficient validation checks and has been addressed with improved logic in the affected components. An attacker would need to entice a user to visit a specially crafted website to trigger the exploit. The vulnerability is fixed in Safari 26.5.2, iOS 26.5.2, iPadOS 26.5.2, and macOS Tahoe 26.5.2.

## Affected products

- Apple Safari before 26.5.2
- Apple iOS and iPadOS before 26.5.2
- Apple macOS Tahoe before 26.5.2

## Timeline

- 2026-06-29: disclosed
- 2026-06-29: patched

## References

- [https://support.apple.com/en-us/127594](https://support.apple.com/en-us/127594)
- [https://support.apple.com/en-us/127595](https://support.apple.com/en-us/127595)
- [https://support.apple.com/en-us/127685](https://support.apple.com/en-us/127685)

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