CVE-2026-58286
Edge Chromium: spoofing via improper access control.
Is CVE-2026-58286 being exploited?
Not confirmed. CVE-2026-58286 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 0.42% probability of exploitation in the next 30 days.
How severe is CVE-2026-58286?
CVE-2026-58286 is rated High with a CVSS score of 8.1. 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-2026-58286?
Yes. A fix has been recorded for CVE-2026-58286. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-58286 affect?
CVE-2026-58286 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-2026-58286?
Update Edge to the latest Chromium-based version when available.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Allows unauthorized network spoofing, enabling MITM-like impersonation.
Patch when possible
- 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.