---
id: "CVE-2026-88077"
kind: "vulnerability"
aliases: ["CVE-2026-88077"]
title: "Microsoft Edge: integer overflow lets a network attacker gain elevated privileges"
severity: "high"
cvss: 8.8
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "Microsoft Edge (Chromium-based)", "fixed": ["154.0.4258.62"], "affected": "< 154.0.4258.62", "ecosystem": "vendor"}]
ecosystems: []
tags: ["chromium", "microsoft-edge", "other", "windows"]
not_affected_if: []
published_at: "2026-10-29T16:19:52+00:00"
first_seen_at: "2026-10-29T16:26:01+00:00"
updated_at: "2026-10-29T16:34:56+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-88077", "first_seen_at": "2026-10-29T16:26:01+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-10-29T16:34:56+00:00"}]
---

# Microsoft Edge: integer overflow lets a network attacker gain elevated privileges

Integer overflow (CWE-190) in Microsoft Edge (Chromium-based). An attacker who gets a user to open a crafted website could gain SYSTEM privileges. Microsoft rates it Important, CVSS 8.8, not exploited, not publicly disclosed. Fixed in 154.0.4258.62.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Microsoft Edge (Chromium-based) affected < 154.0.4258.62 fixed 154.0.4258.62

## How to check

Open edge://settings/help (Help and feedback > About Microsoft Edge). Versions below 154.0.4258.62 are vulnerable.

## Fix

Update Microsoft Edge (Chromium-based) to 154.0.4258.62 or later (Edge menu > Help and feedback > About Microsoft Edge).

## Timeline

- 2026-10-29T16:26:01+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-88077
- 2026-10-29T16:34:56+00:00 analyst — Read MSRC page: fixed in Edge 154.0.4258.62 (Oct 26 2026), not exploited, not public, Less Likely; user must visit crafted site; SYSTEM privileges per FAQ. No PoC checked beyond MSRC.

## Documents

- [advisory] MSRC: CVE-2026-88077 Edge (Chromium-based) Elevation of Privilege https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88077

## From the sources

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

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_