Widely deployed Edge browser; critical RCE risk could disrupt orgs across sectors.
CVE-2026-58289
Type confusion in Edge allows remote code execution over network.
Is CVE-2026-58289 being exploited?
Not confirmed. CVE-2026-58289 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 2.0% probability of exploitation in the next 30 days.
How severe is CVE-2026-58289?
CVE-2026-58289 is rated Critical with a CVSS score of 9.0. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-58289?
Yes. A fix has been recorded for CVE-2026-58289. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-58289 affect?
CVE-2026-58289 affects Microsoft Edge (Chromium-based). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-58289?
Patch when available; enable auto-update; monitor and segment affected hosts.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution via network exploiting Edge type confusion; attacker could take control of target host.
Immediate action required
- affected>= 1.0.0.0 and < 150.0.4078.48
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.