---
id: "CVE-2026-119744"
kind: "vulnerability"
aliases: ["CVE-2026-119744"]
title: "Cendio ThinLinc: web client flaw lets a logged-in user impersonate root"
severity: "high"
cvss: 8.8
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["cendio", "package", "remote-desktop", "self-hosted", "thinlinc"]
not_affected_if: ["versions-outside-4.1.0-4.20.0", "web-client-disabled"]
published_at: "2026-11-05T15:17:20+00:00"
first_seen_at: "2026-11-05T15:39:21+00:00"
updated_at: "2026-11-05T15:40:45+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-119744", "first_seen_at": "2026-11-05T15:39:21+00:00"}]
exploit_sources: []
---

# Cendio ThinLinc: web client flaw lets a logged-in user impersonate root

ThinLinc's browser-based web client (tlwebaccess) has an improper authentication flaw in its multi-step login flows such as one-time passwords, login banners and expired password prompts. An attacker who already has a valid account can switch to another user, including root, and gain administrative access.

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

## How to check

- Check the installed ThinLinc version on the server; the sources say versions 4.1.0 through 4.20.0 are affected
- Confirm whether the browser-based web client (tlwebaccess) is enabled on the server

## Fix

- Move to a ThinLinc release newer than `4.20.0`; the sources do not name the exact fixed version

## Timeline

- 2026-11-05T15:39:21+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-119744

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/cendio-thinlinc-improper-authentication-via-web-access

## From the sources

Cendio ThinLinc contains an improper authentication vulnerability in its browser-based web client (tlwebaccess) that allows an authenticated attacker to impersonate any other user, including root, by exploiting flaws in multi-step authentication flows such as one-time passwords, login banners, or expired password prompts. Attackers can leverage this authentication bypass during the multi-step login process to gain unauthorized access to other user accounts, including administrative privileges, in versions from 4.1.0 through 4.20.0.

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