CVE-2025-43526

Restricted Web API access via file URL

Published Dec 17, 2025 · Updated Dec 17, 2025

URL validation failure in Apple Safari and macOS before 26.2 allows attackers to access restricted Web APIs through file URLs. Safari fails to validate a file URL before granting its web content access to Web APIs that Lockdown Mode should block. Exploitation requires a Mac with Lockdown Mode enabled and web content opened from a file URL; Apple has not identified the restricted APIs or resulting data or actions.

CVSS severity9.8
Critical
EPSS probability0.53%
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

URL validation failure in Apple Safari and macOS before 26.2 allows attackers to access restricted Web APIs through file URLs. Safari fails to validate a file URL before granting its web content access to Web APIs that Lockdown Mode should block. Exploitation requires a Mac with Lockdown Mode enabled and web content opened from a file URL; Apple has not identified the restricted APIs or resulting data or actions.

The record

CVE
CVE-2025-43526
Published
Dec 17, 2025
Updated
Dec 17, 2025
Vendor
Apple
Product
Safari
Classifications
CWE-601
Attack vector
Unavailable
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 17, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 17, 2025Record 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=unspecified <26.2

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesunauthenticated

What is affected?

Apple · Safariversion=unspecified <26.2
Apple · macOSversion=unspecified <26.2

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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)
VectorUnavailable
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

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