# CVE-2026-86898 — Apple Safari

> As of 2026-09-17, CVE-2026-86898 is a MEDIUM-severity vulnerability in Apple Safari, CVSS v3.1 5.4, EPSS 0.1% (8.8th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-86898, most recently “Apple Ships 273-CVE Coordinated Security Update Across iOS 27, macOS, watchOS, tvOS, visionOS, Safari, and Xcode — Bundles a Previously KEV-Listed Pre-Auth Screen Sharing RCE”.

**Last updated:** 2026-09-17

## What is CVE-2026-86898?

A logic issue was addressed with improved state management. This issue is fixed in Safari 27, iOS 27 and iPadOS 27, macOS Golden Gate 27, visionOS 27. Opening a maliciously crafted webarchive file may lead to universal cross-site scripting.

The record classifies CVE-2026-86898 under weakness class [CWE-79](https://intel.threadlinqs.com/cwe/CWE-79). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first. 4 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 39 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 5.4 — MEDIUM (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N`)
- **EPSS (FIRST):** 0.1% probability of exploitation in the next 30 days, higher than 8.8% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 3.1/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-14, last modified 2026-09-17

## Is CVE-2026-86898 being exploited?

It currently carries a trending score of 31 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Apple](https://intel.threadlinqs.com/vendors/apple): Safari, iOS and iPadOS, macOS, visionOS

## How to fix CVE-2026-86898

No vendor patch reference has been recorded for CVE-2026-86898 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-86898

1 tracked threat in the Threadlinqs corpus references CVE-2026-86898, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Apple Ships 273-CVE Coordinated Security Update Across iOS 27, macOS, watchOS, tvOS, visionOS, Safari, and Xcode — Bundles a Previously KEV-Listed Pre-Auth Screen Sharing RCE](https://intel.threadlinqs.com/threat/TL-2026-2522) — CRITICAL · 2026-09-15

## Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-10-10.

**Other references**

- [support.apple.com](https://support.apple.com/en-us/149034)
- [support.apple.com (149035)](https://support.apple.com/en-us/149035)
- [support.apple.com (149038)](https://support.apple.com/en-us/149038)
- [support.apple.com (149039)](https://support.apple.com/en-us/149039)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-86898
Full detection coverage and IOCs for threats exploiting CVE-2026-86898 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp