CVE-2026-70339: Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability
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
- What
- Type confusion in Microsoft Edge allows an unauthorized attacker to execute code over a network.
- Who is affected
- Microsoft Edge deployments with unpatched versions are affected.
- Urgency
- Medium priority; network-based RCE with CVSS 5.4 requires timely patching despite no active exploitation.
- Action
- Update Microsoft Edge to the latest patched version.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70339
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-2026-703390.24% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 15% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-70339 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
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