What is CVE-2025-43526?

CVE-2025-43526 is a critical-severity vulnerability in Apple Macos, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 9.8/10. Published 2025-12-17.

How severe is CVE-2025-43526?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Open Redirect in Apple Macos

CVE-2025-43526

This issue was addressed with improved URL validation. This issue is fixed in Safari 26.2, macOS Tahoe 26.2. On a Mac with Lockdown Mode enabled, web content opened via a file URL may be able to use Web APIs that should be restricted.

Vulnerability class: Open Redirect

EPSS: 0.005 (39.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Apple Macos — versions 0
Apple Safari — versions 0

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

product-security@apple.com (Release Notes, Vendor Advisory)
product-security@apple.com (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2025-43526?: CVE-2025-43526 is a critical-severity vulnerability in Apple Macos, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 9.8/10. Published 2025-12-17.
How severe is CVE-2025-43526?: Critical severity. CVSS v3 base score is 9.8 out of 10.