Microsoft security advisory (AV26-747)
Serial Number: AV26-747 Date: July 27 2026 Microsoft security advisory (AV26-747) As of July 26, 2026, Microsoft is affected by vulnerabilities in the following product: Microsoft Edge (Chromium-based) Prior to 150.0.4078.99 The Cyber Centre encourages users and administrators to review the provided web links and apply any necessary updates as they become available. Security Update Guide - Microsoft Security Response Center Security Update Guide - Microsoft Security Response Center (1) Security Update Guide - Microsoft Security Response Center (2) Security Update Guide - Microsoft Security Response Center (3)
CSIRTS triage
- What
- Multiple vulnerabilities have been identified in Microsoft Edge.
- Who is affected
- Users of Microsoft Edge versions prior to 150.0.4078.99.
- Urgency
- Remediation is necessary as vulnerabilities could be exploited.
- Action
- Update Microsoft Edge to version 150.0.4078.99 or later.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://cyber.gc.ca/en/alerts-advisories/microsoft-security-advisory-av26-747
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-2026-579780.22% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 12% of all scored CVEs.
- Low exploitation riskCVE-2026-579890.44% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 36% of all scored CVEs.
- 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-2026-57978 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-57989 | coverage & exploitation status | NVD · CVE.org |
| 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.
- 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
- highCVE-2026-57989: Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to …nvd
- mediumCVE-2026-57978: Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to …nvd
- highCVE-2026-57989: Microsoft Edge (Chromium-based) Information Disclosure Vulnerabilitymsrc
- mediumCVE-2026-57978: Microsoft Edge (Chromium-based) Spoofing Vulnerabilitymsrc
- highCVE-2026-57990: Microsoft Edge (Chromium-based) Information Disclosure Vulnerabilitymsrc
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