---
id: "CVE-2026-116596"
kind: "vulnerability"
aliases: ["CVE-2026-116596"]
title: "Pyrus Sync for Windows: missing authorization lets local users gain privileges"
severity: "high"
cvss: null
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["other", "pyrus-sync", "windows"]
not_affected_if: ["product-not-installed"]
published_at: "2026-10-26T17:17:27+00:00"
first_seen_at: "2026-10-26T17:31:22+00:00"
updated_at: "2026-10-26T17:33:32+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116596", "first_seen_at": "2026-10-26T17:31:22+00:00"}]
---

# Pyrus Sync for Windows: missing authorization lets local users gain privileges

Pyrus Sync for Windows runs a service named PyrusSyncService that does not enforce authorization checks on its ISyncService contract. A local attacker with unprivileged access can use it to create files and escalate privileges on the Windows machine.

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

## How to check

- unknown

## Fix

- unknown

## Timeline

- 2026-10-26T17:31:22+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-116596

## From the sources

Pyrus Sync for Windows contains a local privilege escalation vulnerability caused by missing authorization controls in its PyrusSyncService Windows service, which allow an attacker with unprivileged access to create files using the ISyncService contract.

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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_