# CVE-2026-65804 — Microsoft Edge (Chromium-based)

> As of 2026-10-08, CVE-2026-65804 is a MEDIUM-severity vulnerability in Microsoft Edge (Chromium-based), CVSS v3.1 6.1, EPSS 0.4% (33.6th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-65804, most recently “GovCERT.HK Security Alert A26-08-01: Multiple Vulnerabilities in Microsoft Edge, Office 2019/LTSC 2021/LTSC 2024, Excel 2016, and Microsoft 365 Apps for Enterprise”.

**Last updated:** 2026-10-08

## What is CVE-2026-65804?

Improper control of generation of code ('code injection') in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform spoofing over a network.

The record classifies CVE-2026-65804 under weakness class [CWE-94](https://intel.threadlinqs.com/cwe/CWE-94). 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. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 85 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 6.1 — MEDIUM (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C`)
- **EPSS (FIRST):** 0.4% probability of exploitation in the next 30 days, higher than 33.6% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-03, last modified 2026-10-08

## Is CVE-2026-65804 being exploited?

It currently carries a trending score of 26 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Microsoft](https://intel.threadlinqs.com/vendors/microsoft): Edge (Chromium-based)

## How to fix CVE-2026-65804

No vendor patch reference has been recorded for CVE-2026-65804 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-2026-65804

1 tracked threat in the Threadlinqs corpus references CVE-2026-65804, either in the campaign’s CVE list or as an indicator on the campaign record.

- [GovCERT.HK Security Alert A26-08-01: Multiple Vulnerabilities in Microsoft Edge, Office 2019/LTSC 2021/LTSC 2024, Excel 2016, and Microsoft 365 Apps for Enterprise](https://intel.threadlinqs.com/threat/TL-2026-1827) — MEDIUM · 2026-08-03

## Sources

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

**Vendor advisory and patch**

- [msrc.microsoft.com — vendor advisory](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65804)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-65804
Full detection coverage and IOCs for threats exploiting CVE-2026-65804 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp