CVE-2026-58525: Microsoft Edge (Chromium-based) Security Feature Bypass Vulnerability

highCVSS 8.2CVE-2026-58525

Improper access control in Microsoft Edge (Chromium-based) allows an unauthorized attacker to bypass a security feature over a network.

CSIRTS triage

vendor: Microsoft product: Microsoft Edge Authentication bypass

What: Improper access control allows an unauthorized attacker to bypass a security feature over a network.
Who is affected: Users of Microsoft Edge (Chromium-based).
Urgency: Remediation is urgent due to the high severity of the vulnerability.
Action: Update Microsoft Edge to the latest version.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch Microsoft Edge

Get an email when a new Microsoft Edge advisory drops — max one per day, one-click unsubscribe.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 8.2
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58525

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-2026-585250.37% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 30% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-58525	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Microsoft Edge

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownMicrosoft Edge Multiple Vulnerabilitieshkcert · 2026-08-24
unknownMultiple vulnerabilities in Microsoft Edge (August 21, 2026)cert-fr-avis · 2026-08-21
unknownMicrosoft Edge security advisory (AV26-822)cccs · 2026-08-17
high[NEW] [high] Microsoft Edge: Vulnerability enables code executioncert-bund · 2026-08-17
unknownMicrosoft Edge Multiple Vulnerabilitieshkcert · 2026-08-17
unknownMultiple vulnerabilities in Microsoft Edge (August 17, 2026)cert-fr-avis · 2026-08-17