CVE-2026-88077

Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability

CVE-2026-88077 is fixed in 4 products on 2 platforms, first by Microsoft Edge Dev 155.0.4273.0, released September 11, 2026. It is not reported as exploited. Patch Radar priority: High.

HighFixed on 2 platforms

CVSS

8.8

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0063

50th percentile

<p>Integer overflow or wraparound in Microsoft Edge (Chromium-based) allows an unauthorized attacker to elevate privileges over a network.</p>

Where it's fixed

Product	Fixed in	Fix	Released
Windows apps
Microsoft Edge	154.0.4258.62	Microsoft Edge 154.0.4258.62	Oct 5, 2026
Microsoft Edge Beta	155.0.4283.33	Microsoft Edge Beta 155.0.4283.33	Oct 2, 2026
Microsoft Edge Dev	155.0.4273.0	Microsoft Edge Dev 155.0.4273.0	Sep 11, 2026
Microsoft Edge WebView2 Runtime	154.0.4258.62	Microsoft Edge WebView2 Runtime 154.0.4258.62	Oct 5, 2026
macOS
Microsoft Edge	154.0.4258.62	Microsoft Edge 154.0.4258.62	Oct 4, 2026

Details

Published
October 26, 2026
Weakness
Integer Overflow or Wraparound
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88077

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