CVE-2025-30466Network attack vector

Same Origin Policy bypass via faulty state management

Published May 29, 2025 · Updated Apr 2, 2026

Origin validation error in Safari before 18.4 allows remote attackers to bypass the Same Origin Policy via crafted website content. Apple attributes the flaw to Safari state management but has not disclosed the faulty state transition or origin-checking locus. The attack surface is browser processing of attacker-controlled content; the record does not specify which cross-origin data or actions become accessible.

CVSS severity9.8
Critical
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Origin validation error in Safari before 18.4 allows remote attackers to bypass the Same Origin Policy via crafted website content. Apple attributes the flaw to Safari state management but has not disclosed the faulty state transition or origin-checking locus. The attack surface is browser processing of attacker-controlled content; the record does not specify which cross-origin data or actions become accessible.

The record

CVE
CVE-2025-30466
Published
May 29, 2025
Updated
Apr 2, 2026
Vendor
Apple
Product
iOS and iPadOS
Classifications
CWE-346, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=0 <18.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · iOS and iPadOSversion=0 <18.4
Apple · visionOSversion=0 <2.4
Apple · Safariversion=0 <18.4
Apple · macOSversion=0 <15.4

Published CVSS scores

9.8CISA ADP VulnrichmentCVSS: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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-346Origin Validation Error
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

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Your stack

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