CVE-2026-57990: Microsoft Edge (Chromium-based) Information Disclosure Vulnerability

highCVSS 7.4CVE-2026-57990

Files or directories accessible to external parties in Microsoft Edge (Chromium-based) allows an unauthorized attacker to disclose information over a network.

CSIRTS triage

vendor: Microsoft product: Edge Information disclosure

What: This vulnerability allows an unauthorized attacker to disclose information over a network.
Who is affected: Microsoft Edge (Chromium-based) deployments are affected.
Urgency: Remediation is high urgency due to a high severity rating.
Action: Update Microsoft Edge to the latest version.

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

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7.4
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-57990

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-2026-579900.94% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 58% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-57990	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

unknownMicrosoft security advisory (AV26-747)cccs
medium[NEW] [medium] Microsoft Edge: Multiple vulnerabilities allow information disclosure and spoofing attackscert-bund
unknownMicrosoft Edge Multiple Vulnerabilitieshkcert
unknownMultiple vulnerabilities in Microsoft Edge (July 27, 2026)cert-fr-avis
highCVE-2026-57990: Files or directories accessible to external parties in Microsoft Edge (Chromium-based) allows …nvd

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.

medium[NEW] [medium] Microsoft Edge for Android: Vulnerability allows disclosure and manipulation of filescert-bund · 2026-07-29
unknownMultiple Vulnerabilities in Microsoft Edge (July 29, 2026)cert-fr-avis · 2026-07-29
mediumCVE-2026-62828: Improper input validation in Microsoft Edge for Android allows an unauthorized attacker to per…nvd · 2026-07-28
medium[NEW] [medium] Microsoft Edge: Multiple vulnerabilities allow information disclosure and spoofing attackscert-bund · 2026-07-27
unknownMicrosoft Edge Multiple Vulnerabilitieshkcert · 2026-07-27
unknownMultiple vulnerabilities in Microsoft Edge (July 27, 2026)cert-fr-avis · 2026-07-27