CVE-2026-58285: Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability

highCVSS 8.3CVE-2026-58285

Access of resource using incompatible type ('type confusion') in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.

CSIRTS triage

vendor: Microsoft product: Microsoft Edge (Chromium-based)Remote code execution

What: Type confusion allows an unauthorized attacker to execute code over a network.
Who is affected: Users of Microsoft Edge (Chromium-based) with the affected version.
Urgency: Remediation is high urgency due to the high severity and potential for exploitation.
Action: Apply the latest security updates for Microsoft Edge.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 8.3
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58285

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-582850.61% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 46% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-58285	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.