---
id: "CVE-2026-77882"
page: "https://infrastack.ai/live/CVE-2026-77882"
kind: "vulnerability"
aliases: ["CVE-2026-77882"]
title: "Lenovo System Update: deserialization flaw lets a local user gain elevated privileges"
severity: "high"
cvss: 8.5
epss: null
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["lenovo", "lenovo-system-update", "vendor", "windows"]
not_affected_if: ["no-lenovo-system-update-installed"]
published_at: "2026-11-11T17:17:20+00:00"
first_seen_at: "2026-11-11T17:28:22+00:00"
updated_at: "2026-11-11T17:30:00+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-77882", "first_seen_at": "2026-11-11T17:28:22+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-11-11T17:30:00+00:00"}]
exploit_sources: []
---

# Lenovo System Update: deserialization flaw lets a local user gain elevated privileges

Link for people: https://infrastack.ai/live/CVE-2026-77882 (this .md is for agents)

Lenovo System Update deserializes untrusted data without checking it. A local authenticated user can run code with elevated privileges.

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

## How to check

Check the installed Lenovo System Update version (Windows: Programs and Features, or the app's About screen). Lenovo's advisory for this CVE was not yet found, so the affected range is unknown; compare against it once published. Latest known release is 5.08.04.85, but it is not confirmed to contain a fix for this CVE.

## Timeline

- 2026-11-11T17:28:22+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-77882
- 2026-11-11T17:30:00+00:00 analyst — Brand new CVE (published today). Lenovo's own advisory for it not found; NVD page returned nothing, searches only surface sibling CVE-2026-6387 (fixed 5.08.04.85, a different bug). Affected/fixed versions unknown; not inferred from sibling. Recheck for a LEN- advisory on support.lenovo.com/product_security.

## From the sources

A deserialization of untrusted data vulnerability was discovered in Lenovo System Update that could allow a local authenticated user to execute code with elevated privileges.

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