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CVE-2026-57978: Microsoft Edge (Chromium-based) Spoofing Vulnerability

mediumCVSS 5.4CVE-2026-57978
Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform spoofing over a network.

CSIRTS triage

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

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 5.4
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-57978

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.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-57978coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

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