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CVE Record

CVE-2026-28871: A logic issue was addressed with improved checks.

A logic issue was addressed with improved checks. This issue is fixed in Safari 26.4, iOS 18.7.7 and iPadOS 18.7.7, iOS 26.4 and iPadOS 26.4, macOS Tahoe 26.4. Visiting a maliciously crafted website may lead to a cross-site scripting attack.

MediumCVSS 4.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

A malicious website can exploit a logic flaw in affected Apple software to perform cross-site scripting. Successful exploitation requires a user to visit the crafted site and may expose limited information. Apple corrected the issue in the listed Safari, iOS, iPadOS, and macOS releases.

Executive priority

Prioritize deployment through the normal expedited browser and operating-system patch cycle. Immediate emergency action is not supported by the supplied evidence, but internet-facing web processing and ordinary browsing make delayed patching an avoidable exposure.

Technical view

CVE-2026-28871 is a CWE-79 cross-site scripting issue caused by insufficient logic checks. It is remotely reachable through web content without privileges but requires user interaction. The supplied CVSS 3.1 score is 4.3, with low confidentiality impact and no stated integrity or availability impact.

Likely exposure

Exposure is most likely on Apple devices or Safari installations that have not received Safari 26.4, iOS/iPadOS 18.7.7 or 26.4, or macOS Tahoe 26.4, as applicable. The supplied records do not define precise vulnerable version ranges beyond identifying the fixed releases.

Exploitation context

The source bundle does not report active exploitation, and the CVE is not identified as CISA KEV. Exploitation requires visiting a maliciously crafted website. No evidence supplied here establishes exploit availability, attack prevalence, or targeting.

Researcher notes

The public description provides no affected component, vulnerable version boundaries, root-cause detail, or proof-of-concept information. The CVSS vector states low confidentiality impact only, despite the cross-site scripting classification. Conclusions about broader impact or exploitability would exceed the available evidence.

Mitigation direction

  • Update Safari to version 26.4 or a later vendor-supported release.
  • Update iOS and iPadOS to 18.7.7, 26.4, or later, as applicable.
  • Update macOS Tahoe to 26.4 or a later vendor-supported release.
  • Consult Apple guidance for devices unable to install the listed releases.

Validation and detection

  • Inventory Safari, iOS, iPadOS, and macOS versions across managed assets.
  • Confirm each applicable device reports the named fixed release or later.
  • Verify update-management records show successful installation, not merely update approval.
  • Review Apple advisories to confirm the correct release for each supported device branch.
Prepared
Confidence
medium
Sources
6

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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-79: User-session and phishing behavior lookup

Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2026-28871 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
4.3 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

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.

1CVSS vectors
3Timeline events
1ADP providers
5Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
4.3CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N2.81.4CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

4.3Medium
CVSS 3.1 vector shape for CVE-2026-28871Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
cvssV3_1other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
AppleSafari0Listed
AppleiOS and iPadOS0, 0Listed
ApplemacOS0Listed
Weakness

CWE details

CWE-79

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