# CVE-2026-58281 — Microsoft Edge (Chromium-based)

> As of 2026-07-12, CVE-2026-58281 is a HIGH-severity vulnerability in Microsoft Edge (Chromium-based), CVSS v3.1 8.3, EPSS 0.7% (48.9th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-58281 as of 2026-07-12; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-07-12

## What is CVE-2026-58281?

Deserialization of untrusted data in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.

The record classifies CVE-2026-58281 under weakness class [CWE-502](https://intel.threadlinqs.com/cwe/CWE-502). 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, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 86 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 8.3 — HIGH (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C`)
- **EPSS (FIRST):** 0.7% probability of exploitation in the next 30 days, higher than 48.9% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 6.1/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-07-11, last modified 2026-07-12

## Is CVE-2026-58281 being exploited?

It currently carries a trending score of 42 in the Threadlinqs vulnerability feed.

## Affected products and versions

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

## How to fix CVE-2026-58281

No vendor patch reference has been recorded for CVE-2026-58281 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-2026-58281

No threat campaign in the Threadlinqs corpus currently references CVE-2026-58281, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-07-12.

**Vendor advisory and patch**

- [msrc.microsoft.com — vendor advisory](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58281)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-58281
Full detection coverage and IOCs for threats exploiting CVE-2026-58281 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp