# CVE-2026-86917 — Apple macOS

> As of 2026-09-15, CVE-2026-86917 is a HIGH-severity vulnerability in Apple macOS, CVSS v3.1 7.8, EPSS 0.1% (4.0th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-86917, 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:** 2026-09-15

## What is CVE-2026-86917?

A permissions issue was addressed with additional restrictions. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. An app may be able to gain root privileges.

The record classifies CVE-2026-86917 under weakness class [CWE-280](https://cwe.mitre.org/data/definitions/280.html). Its CVSS v3 base vector states that the flaw requires local access to the host, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 39 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.8 — HIGH (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **EPSS (FIRST):** 0.1% probability of exploitation in the next 30 days, higher than 4.0% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.1/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-14, last modified 2026-09-15

## Is CVE-2026-86917 being exploited?

It currently carries a trending score of 30 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Apple](https://intel.threadlinqs.com/vendors/apple): macOS

## How to fix CVE-2026-86917

No vendor patch reference has been recorded for CVE-2026-86917 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-2026-86917

1 tracked threat in the Threadlinqs corpus references CVE-2026-86917, 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/149035)
- [support.apple.com (149042)](https://support.apple.com/en-us/149042)
- [support.apple.com (149043)](https://support.apple.com/en-us/149043)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-86917
Full detection coverage and IOCs for threats exploiting CVE-2026-86917 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp