Microsoft Edge is a widely deployed browser; a remote security-feature bypass (CVSS 8.2) can impact entire organizations and enable follow-on attacks.
CVE-2026-58525
Remote security-feature bypass in Microsoft Edge (Chromium).
Is CVE-2026-58525 being exploited?
Not confirmed. CVE-2026-58525 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 0.37% probability of exploitation in the next 30 days.
How severe is CVE-2026-58525?
CVE-2026-58525 is rated High with a CVSS score of 8.2. 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-2026-58525?
Yes. A fix has been recorded for CVE-2026-58525. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-58525 affect?
CVE-2026-58525 affects Microsoft Edge (Chromium-based) - Windows, Microsoft Edge (Chromium-based) - macOS, Microsoft Edge (Chromium-based) - Linux. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-58525?
Apply vendor patch when released; restrict Edge network access and monitor logs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote attacker can bypass Edge access controls over the network, enabling unauthorized access or facilitating follow-on exploitation.
Immediate action required
- affected>= 1.0.0.0 and < 150.0.4078.50
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.