RCE in Microsoft Edge (widely deployed browser). A remote-code flaw in a major browser can enable broad compromise and will be relevant across most organizations.
CVE-2026-58281
Deserialization flaw in Microsoft Edge allows remote code execution.
Is CVE-2026-58281 being exploited?
Not confirmed. CVE-2026-58281 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 0.96% probability of exploitation in the next 30 days.
How severe is CVE-2026-58281?
CVE-2026-58281 is rated High with a CVSS score of 8.3. 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-2026-58281?
Yes. A fix has been recorded for CVE-2026-58281. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-58281 affect?
CVE-2026-58281 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-2026-58281?
Apply Microsoft security update when released; restrict Edge use, enforce least privilege, and monitor for suspicious activity.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution via deserialization of untrusted network data; attacker can run arbitrary code in the user's context and compromise endpoints.
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.