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VERIFIEDConfidence: HIGH
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NVD and Feedly confirm the CVE-2026-57989 origin validation error in Microsoft Edge (CVSS 7.4) affecting versions prior to 150.0.4078.99.

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Home/Tech/Microsoft Edge Origin Validation Flaw CVE-2026-57989 Rated High Severity
VERIFIEDBy Xavier Rivera· ·1 min read

Microsoft Edge Origin Validation Flaw CVE-2026-57989 Rated High Severity

Microsoft disclosed CVE-2026-57989, a high-severity origin validation error in Chromium-based Edge that lets an unauthorized attacker disclose information over a network. The flaw is rated CVSS 7.4 and affects versions before 150.0.4078.99.

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Microsoft Edge Origin Validation Flaw CVE-2026-57989 Rated High Severity
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TL;DRAI · 60 sec read

Microsoft disclosed CVE-2026-57989, a high-severity origin validation flaw in its Chromium-based Edge browser. The vulnerability permits an unauthorized attacker to disclose information over a network with a CVSS 3.1 score of 7.4. It affects versions prior to 150.0.4078.99, requiring users to install the available security update from Microsoft.

Microsoft has disclosed a high-severity origin validation error in its Chromium-based Edge browser that can allow an unauthorized attacker to disclose information over a network.

The vulnerability carries a CVSS 3.1 base score of 7.4. The flaw is tracked as CVE-2026-57989. It affects Microsoft Edge versions prior to 150.0.4078.99.
An unauthorized attacker could exploit the flaw to disclose information.

The issue was published to the CVE List and added to the NVD dataset on July 26, 2026. Microsoft Corporation provided the CVSS vector string AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N. This indicates network attack vector, low attack complexity, no privileges required, user interaction required, changed scope, high confidentiality impact, and no integrity or availability impact.
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The weakness is classified as CWE-346 Origin Validation Error. An unauthorized attacker could exploit the flaw to disclose information. The vulnerability was received from Microsoft Corporation on July 26, 2026 at 2:18:25 PM.
This indicates network attack vector, low attack complexity, no privileges required, user interaction required, changed scope, high confidentiality impact, and no integrity or availability impact.
Details appear in Microsoft's security update guide. The reference is available at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-57989. No additional metrics for CVSS 4.0 or 2.0 were provided by NVD at publication.
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The affected product is listed as Microsoft Edge (Chromium-based) version 1.0.0.0 less than 150.0.4078.99. Users should update to the fixed version once available from Microsoft.

EXPERT TAKE

Enterprise security teams should prioritize patching Edge to the 150.0.4078.99 release to mitigate the high confidentiality risk from this network-reachable flaw.

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