CVE-2026-88078

Microsoft Edge (Chromium-based) Spoofing Vulnerability

CVE-2026-88078 is fixed in 4 products on 2 platforms, first by Microsoft Edge Dev 157.0.4322.0, released October 6, 2026. It is not reported as exploited. Patch Radar priority: Routine.

RoutineFixed on 2 platforms

CVSS

4.3

Moderate

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0029

21st percentile

<p>Improper verification of cryptographic signature in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform spoofing over a network.</p>

Where it's fixed

Product	Fixed in	Fix	Released
Windows apps
Microsoft Edge	156.0.4314.42	Microsoft Edge 156.0.4314.42	Oct 22, 2026
Microsoft Edge Beta	157.0.4341.10	Microsoft Edge Beta 157.0.4341.10	Oct 20, 2026
Microsoft Edge Dev	157.0.4322.0	Microsoft Edge Dev 157.0.4322.0	Oct 6, 2026
Microsoft Edge WebView2 Runtime	156.0.4314.42	Microsoft Edge WebView2 Runtime 156.0.4314.42	Oct 22, 2026
macOS
Microsoft Edge	156.0.4314.42	Microsoft Edge 156.0.4314.42	Oct 21, 2026

Details

Published
October 27, 2026
Weakness
Improper Verification of Cryptographic Signature
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88078

For tools and AI agents

This page as data: JSON · Markdown

Link to this page

If this page saved you time, a link to it in your ticket, advisory or write-up helps others find it.

HTML

<a href="https://patchblox.com/security/cve/CVE-2026-88078">CVE-2026-88078 on Patchblox Patch Radar</a>

Reusing the data? How to credit Patch Radar.

Is this on your machines?

Patchblox finds every install below the fixed version on Windows, macOS and Linux, and updates them through your release rings.

Get a demo

Patch Radar data is free to use with attribution. Terms and how to credit it.

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.