---
id: CVE-2026-119744
title: Cendio ThinLinc Improper Authentication via Web Access
summary: >-
  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 authen…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-290
vendor: Cendio
product: ThinLinc
affected:
  - ThinLinc >= 4.1.0 < 4.15.1
  - ThinLinc >= 4.16.0 < 4.16.1
  - ThinLinc >= 4.17.0 < 4.17.1
  - ThinLinc >= 4.18.0 < 4.18.1
  - ThinLinc >= 4.19.0 < 4.19.1
  - ThinLinc >= 4.20.0 < 4.20.1
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-11-05T16:24:14.643454Z'
published: '2026-11-05'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T16:24:31.150Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-119744'
references:
  - url: >-
      https://community.thinlinc.com/t/thinlinc-4-15-1-through-4-20-1-security-release/1985
    label: ThinLinc 4.15.1 through 4.20.1 security release
  - url: 'https://community.thinlinc.com/t/urgent-thinlinc-security-issue/1970'
    label: 'Urgent: ThinLinc security issue'
  - url: >-
      https://www.vulncheck.com/advisories/cendio-thinlinc-improper-authentication-via-web-access
    label: 'VulnCheck Advisory: Cendio ThinLinc Improper Authentication via Web Access'
tags:
  - cve.org
ingestedAt: '2026-11-05T22:38:31.349Z'
---

## Overview

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.

## Affected

- `ThinLinc >= 4.1.0 < 4.15.1`
- `ThinLinc >= 4.16.0 < 4.16.1`
- `ThinLinc >= 4.17.0 < 4.17.1`
- `ThinLinc >= 4.18.0 < 4.18.1`
- `ThinLinc >= 4.19.0 < 4.19.1`
- `ThinLinc >= 4.20.0 < 4.20.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.