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CVE Record

CVE-2018-4309: A cross-site scripting issue existed in Safari.

A cross-site scripting issue existed in Safari. This issue was addressed with improved URL validation. This issue affected versions prior to iOS 12, tvOS 12, Safari 12, iTunes 12.9 for Windows, iCloud for Windows 7.7.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2018-4309 is an Apple Safari cross-site scripting issue. Apple says it was fixed by improving URL validation and affected versions before iOS 12, tvOS 12, Safari 12, iTunes 12.9 for Windows, and iCloud for Windows 7.7.

Executive priority

Handle as a legacy exposure check rather than an emergency, unless the organization still operates old Apple software. The main business risk is leaving outdated browsers or Apple client software in use where web content can be processed.

Technical view

The source describes an XSS flaw in Safari related to URL validation. Public bundle details do not provide CVSS, CWE, attack prerequisites, affected components beyond named Apple products, or exploit mechanics. The vendor fix is improved URL validation in the listed release versions.

Likely exposure

Exposure is mainly legacy Apple clients and Windows systems running Apple software older than the fixed versions named by Apple. Modern managed fleets are likely already updated, but unmanaged kiosks, old Macs, lab devices, and stale Windows iTunes/iCloud installs merit checking.

Exploitation context

The provided sources do not show active exploitation, and the CVE is not listed as KEV. The bundle does not include exploit maturity, public proof-of-concept status, or technical attack conditions, so exploitation likelihood cannot be established from these sources alone.

Researcher notes

The public bundle is sparse: no CVSS vector, CWE, exploit details, or affected build matrix beyond Apple’s version thresholds. Analysis should stay limited to the vendor-described XSS and URL-validation fix unless additional primary sources are reviewed.

Mitigation direction

  • Upgrade affected Apple products to the fixed versions or later.
  • Prioritize legacy endpoints running pre-iOS 12, pre-tvOS 12, or pre-Safari 12 software.
  • Update iTunes for Windows to 12.9 or later where installed.
  • Update iCloud for Windows to 7.7 or later where installed.
  • Check Apple guidance for any platform-specific update paths.

Validation and detection

  • Inventory Apple and Windows endpoints for the affected products and versions.
  • Confirm devices are at or above Apple’s fixed release versions.
  • Review endpoint management reports for unsupported or unmanaged Apple software.
  • Check exception lists for kiosks, lab systems, and legacy Windows Apple components.
Prepared
Confidence
high
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2018-4309 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
6Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/aiOS, tvOS, Safari, iTunes for Windows, iCloud for WindowsVersions prior to: iOS 12, tvOS 12, Safari 12, iTunes 12.9 for Windows, iCloud for Windows 7.7Listed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.